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Quality @iantity 23: 115-136, 1991.
@ 1991 Kfuwer A~~~ernic Publishers. Printed in the ~etherfa~~s.
115
A critique of the use of triangulation in soc ial research
NORMAN W. H. BLAIKIE
Victoria University
of
Technology, RMIT Campus G.P.O. Box 2476V, Melbourn e, Vie. 3001,
Australia
Introduction
It has become an accepted practice to use some form of triangulation in
social research, and introductory textbooks on research methods frequently
advocate its use in some form see, for example, Smith, 1975; Babbie, 1983;
Phillips, 1985).
Discussions about whether and how to combine social research methods
go back to debates about the use of surveys and fieldwork e.g., Vidich and
Shapiro, 1955; Zelditch, 1962; McCall and Simmons, 1969; Sieber, 1973), or
the use of interviews and participant observation e.g., Becker and Geer,
1957; Trow, 1957). More recently, the debates about the relationship be-
tween qualitative and quantitative methods, particularly in evaluation re-
search, have advocated a combination of methods e.g., Britan, 1978; Reich-
ardt and Cook, 1979; Ianni and Orr, 1979; Trend, 1979; Filstead, 1979;
Knapp, 1979; Schwartz and Jacobs, 1979; Heilman, 1980; Patton, 1980;
Kidder, 1981, 1987; Guba and Lincoln, 1981; Louis, 1982; Madey, 1982).
These debates have led to a renewed interest in the use of triangulation
e.g., Greene and McClintock, 1985; McClintock and Greene, 1985; Fielding
and Fielding, 1986; Gilk ef al., 1986; Kolevzon er al., 1988; Bryman, 1988).
Even recent texts on ethnography have argued for its use e.g., Hammersley
and Atkinson, 1983; Burgess, 1984).
The common theme in discussions of triangulation has been the desire to
overcome problems of bias and validity. It has been argued that the defici-
encies of any one method can be overcome by combining methods and thus
capitalizing on their individual strengths. However, the use of triangulation
has been plagued with a lack of awareness of the different and incommensur-
ate ontological and epistemological assumptions associated with various theo-
ries and methods. While some combinations of methods have been used with
common ontologies and epistemologies, serious problems have been created,
although not usually recognized, when methods based on different assump-
tions have been used.
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Norman W. H. Blaikie
This paper examines the origins and use of triangulation in social research,
it explores the use of triangulation in navigation and surveying and how this
differs from its use in social research, it outlines a framework of methodolog-
ica l perspectives in order to identify the major differences in ontology and
epistemology, and it then examines the problems which the use of triangu-
lation has produced. Some suggestions are made about what needs to be
done to overcome these problems.
The origins of triangulation in social research
The use of triangulation, or multiple measures, has been advocated in the
social sciences for nearly three decades. Building on the ideas of Campbell
and Fiske 1959), Webb
et al.
1966) wished to overcome the complacent
dependence on single operational definitions of theoretical concepts, and to
supplement the use of the interview or questionnaire with unobtrusive mea-
sures that do not require the cooperation of the respondent and that do
not themselves contaminate the response 1966: 2). In claiming that all
research methods are biased, they argued for the use of a collection of
methods multiple operationalism) which they believed would reduce the
effect of the peculiar biases of each one. Thus, Webb et al. advocated the
use of a triangulation of measurement processes in the search for the validity
of theoretical propositions.
When a hypothesis can survive the confrontation
of a series of complementary methods of testing, it contains a degree of
validity unattainable by one tested within the more constricted framework
of a single method 1966: 174).
Denzin 1970a: 13) also argued for the use of multiple methods in the
analysis of the same empirical events, and claimed that each method reveals
different aspects of empirical reality.
No single method is always superior. Each has its own special strengths
and weaknesses. It is time for sociologists to recognise this fact and to
move on to a position that permits them to approach their problems with
all relevant and appropriate methods, to the strategy of methodological
triangulation Denzin, 1970b: 471).
Denzin has taken the work of Campbell and Fiske, and Webb et al., as his
starting point and has shared their concern with bias and validity. However,
he has gone beyond their use of multiple methods in the study of the same
object, to advocate the use of multiple triangulation which involves a variety
of data sources, investigators, theories and methodologies.2 Denzin also
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Triangulation 117
allowed for within-method triangulation - using various strategies within one
method, such as a survey questionnaire with different scales measuring the
same empirical uniP3 - and between or across-method triangulation which
combines dissimilar methods to measure the same unit. Denzin preferred
the latter because the flaws of one method are often the strengths of
another, and by combining methods, observers can achieve the best of each,
while overcoming their unique deficiencies 1970a: 308). Thus, the effec-
tiveness of triangulation rests on the assumption that the methods or stra-
tegies used will not share the same biases; their assets will be exploited and
their liabilit ies neutralized Jick, 1983: 138).
Denzins views on triangulation have been very influential in encouraging
social researchers from a variety of traditions to use a combination of meth-
ods and observers in the name of reducing bias and improving validity. His
disciples have, however, adopted his arguments uncritically; it is only recently
that his views have been challenged e.g., Silverman, 1985; Fielding and
Fielding, 1986).
Theoretical triangulation does not necessarily reduce bias, nor does meth-
odological triangulation necessarily increase validity. Theories are gen-
erally the product of quite different traditions, so when they are combined
one may get a fuller picture, but not a more objective one. Similar ly,
different methods have emerged as a product of different theoretical tra-
ditions, and therefore combining them can add range and depth, but not
accuracy. In other words, there is a case for triangulation, but not the one
Denzin makes Fielding and Fielding, 1986: 33).
Triangulation defined
Neither Denzin nor his mentors acknowledged the source of the triangulation
metaphor. However, later supporters of his position have identified its origin
in navigation, military strategy and surveying Smith, 1975: 273; Jick, 1983:
136; Hammersley and Atkinson, 1983: 198).
For someone wanting to locate their position on a map, a single landmark
can only provide the information that they are situated somewhere along
a line in a particular direction from the landmark. With two landmarks,
however, their exact position can be pin-pointed by taking bearings on
both landmarks; they are at the point where the two lines cross. In social
research, if one relies on a single piece of data there is the danger that
undetected error in the data-production process may render the analysis
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118 Norman W. H. Bla ikie
incorrect. If, on the other hand, diverse kinds of data lead to the same
conclusion, one can be a little more confident in that conclusion. This
confidence is well founded to the degree that the different kinds of data
have different types of error built into them Hammersley and Atkinson,
1983: 198).
As we shall see, this statement reveals some of the fallacies in the analogy.
In order to explore this further, a closer examination of the use of triangu-
lation in surveying is required.
Triangulation is used in plane and geodetic surveying as an economical
way of fixing positions on the earths surface.6 In geodetic surveying,
t)riangulation is the method of location of a point from two others of
known distance apart, given the angles of the triangle formed by the three
points. By repeated application of the principle, if a series of points form
the apices of a chain or network of connected triangles of which the
angles are measured, the lengths of all the unknown sides and the relative
positions of the points may be computed when the length of one of the
sides is known Clark, 1951: 145).
This kind of triangulation can be distinguished from both intersection and
resection which are used mainly in plane table surveying. Intersection is
used to locate topographical features by observing them from a number of
known positions, thus forming-a triangle in which one side and the adjacent
angles are known and allowing the position of the third point to be plotted
or calculated. Resection is used to fix an unknown position by measuring,
from it, the angles subtended between at least three known positions, or,
less commonly, the true bearings to two known positions.
Whereas resection and intersection are relatively imprecise methods of
fixing positions when more accurate methods cannot or need not be used,
triangulation is an efficient method, of adequate precision, which avoids
excessive and perhaps impossible linear measurement in large scale situ-
ations. None of these methods inherently produce more precise results than
some single method; they produce appropriate results in particular circum-
stances. It is possible in a network of triangles to have more than the
minimum measurements to fix a position, and thus allow for greater accuracy
through a more complex use of the method of least squares for adjusting
errors. However, given the level of sophistication of the measuring instru-
ments used, only minimum measurement is needed to fix unknown positions
at an appropriate level of accuracy. Al l measurement is of the same kind
and is based on a common ontology and epistemology.
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Triangulation 119
For the most part, the use of the triangulation metaphor in social research
has distorted its use in surveying. For example, in research on school
classrooms, it has been suggested that triangulation means three points of
view.
Triangulation involves gathering accounts of a teaching situation from
three quite different points of view; namely those of the teacher, his pupils,
and a participant observer. . . . Each point of the triangle stands in a
unique epistemological position with respect to access to relevant data
about a teaching situation. . . . By comparing his own account with ac-
counts from the other standpoints a person at one point of the triangle
has an opportunity to test and perhaps revise it on the basis of more
sufficient data Ell iot and Adelman, 1976: 74).
This use of the metaphor implies three different observers looking at some
phenomenon from three vantage points and subsequently cross-checking
their observations in order to produce a more accurate picture. The nearest
that triangulation in surveying could come to this view is of three observers
at the points of a triangle observing each others position, with the
same
kind
of instruments. There can be no concept of all three observing a common
phenomenon. Other uses in social research similar ly distort the original
meaning of triangulation.
Methodological perspectives in sociology: A framework for analysis
A discussion of triangulation in sociological research is complicated by the
pluralistic nature of contemporary sociology, by its variety of theoretical and
methodological perspectives or paradigms. As we shall see, triangulation is
regarded differently by adherents to the various perspectives. Therefore,
before examining the ontological and epistemological issues in the use of
triangulation in sociology, it will be necessary to lay out a framework of
methodological perspectives.
Our task is further complicated by the fact that there have been a variety
of attempts to characterize these perspectives, with a resulting diversity of
schemes. The purposes of these schemes vary and are not all relevant to
our present concerns. The following framework draws mainly on Johnson et
al.
1984), Halfpenny 1979), Giddens 1976), Keat and Urry 1975),
Outhwaite 1983a, 1983b, 1987) and Bhaskar 1975, 1979), but the final
descriptions are my own.
The methodological perspectives are defined in terms of their ontology
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Norman W. H. Blaikie
and epistemology, and include reference to the logic of theory construction,
what counts as data, explanations and theory, criteria of validity, and views
on the particular nature of social reality and the relationship between the
natural and social sciences. The cluster of characteristics produced from these
criteria constitutes a set of ideal types.
Positivism
Posit ivism entails an ontology of events; reality is seen to be constituted of
atomistic, discrete and observable events. Human activity is understood as
observable behaviour taking place in observable, material circumstances.
The world is depicted as a concatenation of antecedent variables which
operate in a law-like manner to produce these events. Social reality is viewed
as a complex of casual relations between events based on an emerging
patchwork of relations between variables. The causes of human behaviour
are regarded as being external to the individual.
In its epistemology, knowledge is seen to be derived from sensory experi-
ence by means of experimental or comparative analysis, and concepts and
generalizations are shorthand summaries of particular observations. A corre-
spondence is posited between sensory experiences and the objects of those
experiences, and between constant conjunctions of such objects of experience
events) and causal laws. These laws are identical with empirical regularities.
Positivism includes two kinds of logic of inquiry: the inductivist and the
hypothetico-deductivist.
Data
are sets of values on sets of variables;
explana-
tions consist of causal relations between variables; and theory consists of
interrelated sets of causal laws.
Validity
is based on experience/observation,
although this may have to be controlled by means of experiments or statistical
manipulation. Positivists believe in the unity of
the sciences.
Interpretivism
Interpretivism entails an
ontology
in which social reality is regarded as the
product of processes by which social actors negotiate the meanings for actions
and situations. Human experience is characterized as a process of interpreta-
tion rather than sensory, material apprehension of the external physical
world, and human behaviour depends on how individuals interpret the con-
ditions in which they find themselves. Therefore, social reality is not some
thing that may be interpreted in different ways; it is those interpretations.
In its epistemology, knowledge is seen to be derived from everyday mean-
ings and interpretations. At one level, knowledge is derived from a descrip-
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Triangulation 121
tion of these everyday meanings and interpretations. At another level, knowl-
edge is gained by both entering the everyday social world in order to grasp
the socially constructed meanings, and then reconstructing these meanings
in sociological language; sociological constructs are generated from everyday
social constructs. The fundamental epistemological principle is that the inte-
grity of the phenomenon should be retained.
The logic is based on the everyday processes by which individuals make
sense of their own social world. It has the appearance of being inductive but
is more correctly described as a double hermeneutic Giddens, 1976) or as
dialogical Blaikie and Stacy, 1984). The data of Interpretive sociology are
intentional or every-day rule-governed behaviour and the intersubjective
meanings of actions and situations; explanations consist of descriptions in
terms appropriate to the actors culture; and theory consists of the cultural
rules or norms that constitute the meaningfulness of interaction. Val idity is
based on convention - negotiated agreements between social actors - and
the willingness of social actors themselves to find an account of their world
acceptable. Interpretivism rejects any notion of a methodological unity of
the sciences.
Realism3
In the Realist ontology, the ultimate objects of scientif ic inquiry are con-
sidered to exist and act independently of scientists and their activity. A
distinction is made between the domains of the empirical, the actual and the
real. The empirical is made up of experiences of events through observation:
the actual includes events whether observed or not; and the real consists of
the processes that generate events. It is an ontology of intransitive structures
and mechanisms which are distinguished from transitive concepts, theories
and laws that are designed to describe them. The social world is viewed as
an objective, material structure of relations which is not accessible to direct
observation.
The aim of Realist science is to explain observable phenomena with refer-
ence to the underlying structures and mechanisms which constitute reality.
Hence, epistemology is based on the building of models of such mechanisms,
such that if they were to exist and act in the postulated way, they would
account for the phenomenon being examined. These models constitute hypo-
thetical descriptions which, it is hoped, wil l reveal reality: reality can only
be known by constructing ideas about it. This is an epistemology of laws as
expressing tendencies of things as opposed to the conjunctions of events of
Positivism).
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Norman W. H. Blaikie
The
logic
is one of retroduction in contrast to induction or deduction),
based on the use of analogy and metaphor.
Data
are the various surface
features of the social world;
explanations
consist of transformations which
map these features on to underlying real structures; and
theory
is about
underlying structural relations.
Validity
is based on the criterion that if it
works it must be true. Realism regards the relationship between social science
and its objects of study as being quite different from the relationship between
the natural sciences and their objects.
Science
is unified in its method but
differentiated in its objects.
While these methodological perspectives are regarded as being incompat-
ible, they cannot be regarded as three exclusive boxes into which all social
research can be classified. Rather, while they identify the central features of
the major theoretical and methodological traditions within social science,
they highlight the tensions and dilemmas associated with all attempts to
understand and explain social life. Each perspective represents a strategic
bias, but theorizers and researchers, operating essentially within one perspec-
tive, appear to be unable to avoid addressing elements of the other perspec-
tives in order to resolve the internal tensions in their work. Hence, according
to Johnson
et al.
1984, p. 22-3), the perspectives must be considered as a
complex set of relationships. This argument, however, should not be used
to support sloppy meta-theoretical thinking.
Problems
The inappropriateness of the triangulation metaphor for soc iological
research
As we have seen, the adoption of the triangulation analogy in Posit ivistic
and Interpretive sociology is based on the view that it is a method for
overcoming problems of bias and validity. However, the ontological and
epistemological incompatibility of some methods is usually ignored.
In its use in surveying, the various measurements are not only of the same
kind, but they also share a common ontology. Normally, any position re-
quires only the minimum number of measurements to fix it. Insofar as
triangulation may incorporate an excess of measurements to fix a position -
for example, through an extended network of triangles - it simply allows for
a more precise adjustment of errors due to the limitations of the instru-
ments and the observers, and the vagaries of such factors as air temperature
and pressure. However, such gains are usually small and have nothing to do
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Triangulation 123
with the reconciliation of the so-called bias of a number of different methods
of measurement.
Therefore, the use of the triangulation analogy in social research is mislead-
ing: it has usually been concerned with reducing error or bias rather than
simply establishing the existence of some phenomenon, or values on some
variable; it advocates the combination of different methods rather than the
use of a single method; and it ignores the ontological and epistemological
issues which the use of multiple methods can entail and which are absent in
its use in surveying.
The meaning of consistencylconvergence or its absence
In claiming for triangulation the possibil ity of more valid measurement, the
advocates need to be able to interpret both convergence of results, or the
lack of such convergence, which follows from the use of different methods
or data sources. If they work with a Posit ivist ontology, convergence could
be interpreted as each measure being relatively unbiased, but lack of conver-
gence leaves open the question of which measures might be biased. If they
work with an Interpretive ontology, with data from different social actors or
groups, convergence may mean that consensus exists on how reality is
viewed, or that a common social reality is shared, while a lack of convergence
may reflect legitimate and different views of reality, or the habitation of
different social worlds. Such differences cannot be used to attribute bias to
any method, If the advocates work with a Realist ontology, there is no way
that the validity of any empirical data can be established; all measurement
has to be directed and interpreted by the constructed model of reality being
used. In the end, the degree to which any model is a valid representation of
reality will be a matter of judgment.
While acknowledging that it is difficult to decide whether or not results
have converged, Jick 1983) went on to argue that
t)he process of compiling research material based on multi-methods is
useful whether there is convergence or not. . . . Overall, the triangulating
investigator is left to search for a logical pattern in mixed-method results.
His or her claim to validity rests on judgment. . . . One begins to view the
researcher as builder and creator, piecing together many pieces of a com-
plex puzzle into a coherent whole Jick, 1983: 144).
The conclusion to be drawn from this discussion is that, regardless of the
methodological perspective adopted, decisions about the relative merits of
different sources of data can only be settled in the context of some theory;
and the choice and application of the theory is a matter of judgment.
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124 Norman W. H. Blaikie
Different views of what it means to combine methods
The recognition of the existence of methods with different ontologies is
a matter of methodological perspective. This is analogous to Halfpennys
argument that conceptions of what is qualitative about social data, and what
is regarded as problems and potentialities for the analysis of qualitative data,
depends on the sociological perspective within which that research is located
1979: 801, 806). For example, while Positivists may consider that qualitative
data can be converted into quantitative data, that qualitative data are incom-
plete quantitative data, genuine Interpretivists regard qualitative data as
authentic data in their own right.
The ontological problems of combining different methods, particularly
quantitative and qualitative methods, is not an issue for Positivists; all meth-
ods are interpreted within a consistent ontology of variables and causal
relationships. Positivists do not recognize the Interpretive ontology as apply-
ing to qualitative methods; when qualitative methods are used, the data can
be translated into variables and quantified. There is likely to be a very
limited concern with socially constructed meanings, and, where there is,
these meanings will be conceived differently than they would be by an
Interpretivist: they will be translated in the same way.
F)rom the perspective provided by the positivist approach, data that are
qualitative in the sense of describing actors meanings are data about
mental states or events that cause the people under study to behave the
way they do. The problem that data thus conceived present for positivists
is that of obtaining reliable measures of these states or events, and the
solution frequently offered is triangulation. . . . However), m)eanings of
actions are not the same as the mental states of the actors Halfpenny,
1979: 815-816).
Therefore, Positivists and Interpretivists conceive and act on subjective
data differently.
The genuine Interpretivist wil l not find triangulation, as expounded by
Denzin for example, an attractive proposition; issues of bias and validity
have different meanings from those presented by the Positiv ists. With an
ontology that allows for multiple realities Schutz, 1962). and an epistemol-
ogy that recognizes that accounts of any social world are relative in time and
space, and to the observer, the use of multiple data sources and multiple
observers does not solve the problems posed by the Posit ivists. Interpretivists
do not share the same concerns, i.e., they are not likely to use triangulation
to reduce bias and increase validity. In addition, Blumer 1969) has argued
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Triangulation 125
that the participant observation/case study method is both the necessary and
sufficient method for symbolic interactionist research Williams, 1976: 127).
It is only recently that these issues have been recognised by some practi-
tioners for example, Guba and Lincoln, 1981; Smith, 1983a, 1983b: Bednarz,
1985; Greene and McClintock, 1985).
W)e suggest that triangulation is possible only within paradigms, that any
effort to compare or integrate findings from different methods requires
the prior adoption of one paradigm or the other, even when . . . the
methods themselves are linked to and implemented within alternative
paradigms Greene and McClintock, 1985: 541).
Invariably, this paradigm is Posit ivism, as is the case for the integration of
qualitative and quantitative methods generally.
The incompatibility of absolutist and relativist ontologies.
There is a tendency amongst the advocates of triangulation, both Posit ivists
and Interpretivists, to assume an absolute reality, with each method providing
a view of some aspect of it. Even the position advocated recently by Fielding
and Fielding 1986) is essentially Positivist and therefore absolutist.
The Positivist approach to triangulation can be illustrated in a study con-
ducted by Jick 1979a; reported in Jick, 1979b and 1983) on the effects of
organizational mergers on employees. He wished to document and examine
the sources and symptoms of anxiety associated with job insecurity. A tri-
angulation approach was adopted covering both feelings and behaviour,
direct and indirect reports, obtrusive and unobtrusive observation.
The research package used in the investigation of the dynamics of
anxiety and job insecurity included many standard features. Surveys were
distributed to a random sample of employees. They contained a combi-
nation of standard and new indices related to stresses and strains. To
complement these data, a subsample was selected for the purpose of
semistructured, probing interviews. The survey also contained items re-
lated to the symptoms of anxiety as weil as projective measures. These
were developed to be indirect, nonthreatening techniques. In addition to
self reports, interviews were conducted with supervisors and coworkers to
record their observations of employees anxiety Jick, 1983: 140-141).
An unobtrusive measure was also used. based on the use by employees of
an archives library, in order to compare current news reports and memoranda
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Norman W. H. Blaikie
regarding the organizations future with past pronouncements. Jick assumed
that
m)ost employees were apparently seeking information to relieve their
anxiety about the uncertain shape of things to come. Hence these vis its to
the archives were treated as expressions of employee anxiety, a thermo-
meter of anxiety level in the organization. The search for information
seemed to represent an attempt to reduce uncertainty. It was hypothesized
that the more people who visited the archives to use the files, the higher
the anxiety level Jick, 1983: 141).
This study is typical of a Positivists use of triangulation in which quantitative
and qualitative methods are combined, although, in contrast to most other
uses of combined methods, Jick saw quantitative results supplementing quali-
tative data. It is also typically Positivistic in the way in which qualitative data
are used within Posi tivistic assumptions. For example, assumptions were
made about the meaning of employee vis its to the archives. It turned out
that those employees who were shown to be most stressed by self reports,
were least like ly to visi t the archives. The disconfirmation of the hypothesis
was later explained in terms of level of education; the poorly educated
tending to rely more on oral communication than written documents. How-
ever, another possible explanation is that those who used the archives were
trade union leaders or polit ical activists who happened to be better educated.
Without a truly Interpretive approach to this problem, no adequate under-
standing can be achieved. Changing the assumptions, and introducing new
variables and correlations, is like trying to navigate in a fog.
Therefore, while Positivists can work with consistent ontological and epis-
temological assumptions in combining quantitative and qualitative methods,
their uses of qualitative methods tend to be restricted and thus fail to achieve
their full potential.
Confusion of perspectives
The discussion of these four problems reveals a great deal of ignorance
or misunderstanding about the significance of the role of methodological
perspectives in social research generally, and in the use of triangulation in
particular. The orthodox use of triangulation, derived mainly -from Denzin,
has perpetuated a great deal of confused claims for research in which it has
been used.
In spite of the fact that Denzin accepted the symbolic interactionists
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Tria~g~l~~io~ 127
position that social reality is a social process and that it therefore changes
over time, he also adopted an absolutist view of reality in terms of the
notion of common units of observation which are social objects in the
environment of the scientist Denzin, 1970a: 298). He considered that each
method reveals different aspects of reality.
Denzin created many dilemmas for himself in consciously or unconsciously
trying to marry Interpretive and Posit ivist ontologies and epistemologies. In
his eclecticism and concern with the reunification of symbolic interactionism,
Denzin adopted essentially Positivistic assumptions under an Interpretive
umbrella. He abdicated the Interpretivist concern for the primacy of mean-
ing in favour of a Positivist concern for validity and bias.
From the point of view of what he would regard as a genuine Interpretivist
position, Douglas 1971) has crit icized the waywardness of many interac-
tionists on the issue of ontology.
The genera1 problem of the interactionist tradition of thought and research
is that its practitioners have rarely seen clearly and consistently the funda-
mental theoretical and methodological differences between a positivistic
absolutist) sociology and a phenomenological or existential sociology. As
a result, their works are repeatedly vitiated by allowing positivistic methods
and ideas to dominate and distort the phenomenological strain of Meads
own works. This is seen especially in their immediate and persistent con-
cern with the causation of items of behaviour . . . , the easy use of
modified ideas of hypothesis testing and verification, the imposition of
ideas of self-lodging on the social actors, and the immediate and unex-
pected) translation of everyday statements into abstract, theoretical state-
ments. , . . T)here remains a great difference between taking everyday life
as the primary reality but partially studying this reality with conventional
absolutist methods and ideas) and systematically studying it in such ways
as to consistently retain the integrity of the phenomena Douglas, 1971:
18).
In his critique of Denzins style of symbolic interactionism, Silverman 1985)
noted Denzins use of method triangulation to
overcome partial views and present something like a complete picture.
Underlying this suggestion is, ironically, . . . elements of a positivist frame
of reference which assumes a single undefined) reality and treats accounts
as multiple mappings of this reality.
For an interactionist, . . . without bias there would be no phenomenon.
Consequently, . . . actions and accounts are situated. The sociologists
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128 Norman W. H. Bla ikie
role is not to adjudicate between participants competing versions but to
understand the situated work that they do. . . . Of course, this does not
imply that the sociologist should avoid generating data in multiple
ways. . . . The mistake only arises in using data to adjudicate between
accounts Silverman, 1985: 105-106).
As followers of Denzins approach to triangulation, Hammersley and Atkin-
son have perpetuated this same confusion in their discussion of validity in
ethnography, but at least they have suggested that o)ne should not . . .
adopt a naively optimistic view that the aggregation of data from different
sources will unproblematically add up to produce a more complete picture
1983: 199). They have recognized that differences between sets of data
derived from different sources, or by different methods, may be important
and illuminating, but they are ultimately concerned with some notion of
absolute truth.
D)ata must never be taken at face value. It is misleading to regard some
as true and some as false. Rather, . . . what is involved in triangulation
is not just a matter of checking whether inferences are valid, but of
discovering which inferences are valid Hammersley and Atkinson, 1983:
200).
An example of the reluctance of an Interpretivist to accept accounts at face
value can be found in Wests 1979) research on the labeling of epilepsy. He
wished to uncover the subjective reality relating to troubles experienced
by parents with an epileptic child. In order to overcome his uneasiness in
accepting parental accounts at face value, he undertook two sub-studies to
test their validity; an observational study of doctor-patient interaction in out-
patient clinics to validate parental perceptions of doctors, and a street-
survey of the knowledge, ideas, and images of epilepsy of the general public
to validate the views parents had about epilepsy before their childs first
seizure.
The kind of dilemma faced by West is, on the one hand, trying to retrieve
what really happened, and, on the other hand, analysing how understanding
is constructed and conveyed by social actors, in the light of whatever it was
that they understood to have happened. As Halfpenny 1979) has observed,
West was trying to be both an ethnomethodologist and a Denzinian interpre-
tivist. In the latter he is caught up in both Posit ivist and Interpretive perspec-
tives.
West is concerned to validate parents accounts of their perceptions of
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Triangulation 129
doctors by triangulation. . . . Here, from a positivist perspective, West
seems concerned to establish an accurate measure of the parents mental
images of doctors. . . .
But Wests work can also be seen to be informed
by the interpretive approach. From the interpretive perspective, doubts
about accepting accounts at face value are due, firstly, to recognizing
that the parties to an interaction have differential power to enforce their
definition of the situation at the expense of the definitions of other parties.
It is here that triangulation becomes relevant within the interpretivist
approach, as a means of sustaining the plausibil ity and thereby increasing
the credibil ity of the definitions of the situation of the less powerful.
Also, within the perspective of the interpretivist approach, doubts about
accepting accounts at face value are, secondly, doubts about having
grasped the culturally appropriate meanings of the actions under study
Halfpenny, 1979: 820).
In contrast to these confused uses of triangulation, Cicourel 1973) has
advocated a specific use in ethnomethodology that is internally consistent; it
is very different from its use by either Positivists, so-called Interpretivists,
or ethnomethodologists such as West. Cicourel called this indefinite triangu-
lation which was devised to reveal the irreparable but practical nature of
accounts used by subjects and researchers 1973: 124). In essence, this
use of triangulation involves subjects, researcher and typists, using audio
recordings and transcripts of conversations to produce a variety of versions
of the original interaction. The indefinite triangulation notion attempts to
make visible the practicality and inherent reflexivity of everyday accounts
Cicourel, 1973: 124).
Cicourel il lustrated this procedure by gathering information on the lan-
guage acquisition of young children in the home setting. Mother and child
were tape recorded for one hour during lunch. The tape was transcribed
verbatim and the transcript read by the mother while listening to the tape:
her comments were recorded to produce another version. The typist listened
to the tape again and described what she thought was going on: she corrected
her original transcript where she felt this was necessary. Phonetic tran-
scription produced another version.
With a number of different versions of an interaction scene, the problem is
deciding which version captures the childs language, the childs referencing
ability, the parents constructions, and so on.
The reader could now say that we should simply combine the different
versions to produce the best one possible, but the point is that different
versions could have been produced indefinitely by simply hiring different
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130 Norman W. H. Blaikie
typists and providing the mother with different transcripts Cicourel, 1973:
124).
This use of triangulation is consistent with the ontological and epistemological
assumptions of ethnomethodology. But the question arises as to why it should
be called triangulation,
The question of whether it is possible to combine methods from different
methodological perspectives is now being examined more seriously. For
example, in his critique of attempts to integrate quantitative and qualitative
methods, Smith 1983) supported the view that research undertaken from a
quantitative Positivist) perspective is different from that using an interpre-
tive perspective.
Each approach sponsors different procedures and has different epistemo-
logical implications. One approach takes a subject-object position on the
relationship to subject matter; the other takes a subjective position. One
separates facts and values, while the other perceives them as inextricably
mixed. One searches for laws, and the other seeks understanding. These
positions do not seem to be compatible given our present state of thinking
Smith, 1983: 12).
Thus, the quantitative-qualitative debate has forced researchers to address
the epistemological question of what counts as knowledge. If researchers
do not discuss this question, they are forfeiting any participation in determin-
ing the basis for the authority of their knowledge Smith, 1983: 12-13). In
the context of evaluation research, Bednarz 1985) has argued that
there is reason to believe that qualitative and quantitative approaches
cannot be synthesized because they occupy alternative - rather than comp-
lementary - philosophical spaces. . . . Any synthesis must necessarily adopt
the perspective of one or the other, so that any effort to reach a middle
ground does so only in terms of a single perspective Bednarz, 1985: 289-
90).
With reference specifically to the use of triangulation, he stated that
successful cross-philosophy triangulation is not possible, because of the
necessity of subsuming one approach to another. . . . Nor can the re-
searcher pick one aspect of an approach and one from another without
making - explic itly or implicitly - commitments regarding these matters
Bednarz, 1985: 304).
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Triangulation 131
Conclusion
It should be clear from the above analysis that triangulation is much more
problematic for eclectic Interpretivists, unreflective ethnographers, and way-
ward ethnomethodologists than it is for Posit ivists, or possibly for Realists;
it has no relevance for genuine Interpretivists and ethnomethodologists. The
failure to recognize the implications of using incompatible ontologies and
epistemologies has led either to a muddy confusion about bias and validity in
the case of eclectic Interpretivists) or false pretensions about what combining
quantitative and qualitative methods means in the case of the Positivists).
It should also be clear that triangulation means many things to many people
and that none of the uses in sociology bears any resemblance to its use in
surveying.
It is legitimate, and it may be useful, to use multiple methods within a
particular methodological perspective e.g., in the development of attitude
scales), or different data sources, provided they are used consistently within
one perspective Bednarz, 1985: 304), but it is not legitimate, and it creates
considerable confusion, to use methods drawn from different methodological
perspectives. However, this leaves open the possibi lity of using different
methods sequentially, such that each in turn provides a basis for the develop-
ment of subsequent stages of the research process see, for example, Zeld-
itch, 1962; Sieber, 1973; Ianni and Orr, 1979; Madey, 1982: Burgess, 1984).
But as Greene and McClintock have pointed out, this can hardly be called
triangulation as the methods are deliberately interactive, not independent,
and they are applied singly over time so that they may not be measuring the
same phenomenon 1985: 525).
All this suggests a need:
1) for a moratorium on the use of the concept of triangulation in social
research:
2) to identify appropriate and inappropriate combinations of methods and
data sources, in light of the incommensurability of ontological and epis-
temological assumptions of methodological perspectives; and,
3) to develop suitable new labels for these appropriate combinations.
Notes
Various other terms have been used to refer to the same procedure, e.g.. multiple oper-
ationalism (Webb
et
al., 1966), combined operations (Stacey. 1969). mixed strategies
(Douglas. 1976). and multi ple strategies (Burgess. 1982. 1984).
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132 Norman W. H. Bla ikie
* Denzin used the terms method, methodology and methodological interchangeably thus
failing to distinguish betwee n tech niques of data gathering and the critical exa mination of the
methods wh ich are claimed to produce val id kno wledge.
s This term of Denzins seem s to imply a concern with variables rather than social processes.
4 The fallacies of this argumen t will be taken up later.
The author is a registered land surveyor and a membe r of the New Zealand Insti tute of
Surveyors. He practiced in New Zealand and Malaysia for 16 years before taking up sociology
as a career.
Surveying is the art of making such measurem ents of the relative posit ions of points on the
surface of the earth that, on drawing them down to scale, natural and art if ic ial features may be
exhibited in their correc t horizontal and vertical relationships (Clark , 1946: 1). The A rt of
Surveying comprises the making of measurem ents on a large scale with a faci l i ty and accuracy
which require special training. (I t) comprises the selection of the mea surements to be made and
the method of making them w ith a view to their use in solving problems of various kinds, usual ly
in connec tion with th e definition of boundaries of land or the design of engineering wo rks
(Foxal l , 1957: 4). There is no such thing as absolute m easuremen t; al l observations are subject
to unavoidable deviations from accuracy due to imperfections in instruments. l imitat ions in
power of observations, etc. Errors need to be distinguished from mistake s.
Geodetic surveying is concerned with the precise measurement of the posit ions on the earths
surface of a syste m of widely separated points. The relative posit ions of these points in terms
of distance and direction, and their absolute position in term s of latitude, longitude and elevation
above mean sea level, provide a framewo rk of controls in which more local ized fo rms of
surveying and engineering can take place.
s Plane tabl ing is a method of surveying by which maps are created through the simultaneous
use of field observ ations and plotting. It wa s employe d exten sively for recording topographical
features.
See, for example, Ritzer (1975). Kea t and Urry (1975). Smart (1976). Benton (1977), Cu ff
and Payne (1979). Haralambos (1980). Hughes (1980). and Johnson et al . (1984).
I Johnso n er al. (1984) addres sed the theoretical fragme ntation in sociology by developing a
matrix o f solutions to the fundamental ontological and epistemological questions. This matrix
consisted of four categories: empiricism. subjectivism, substantialism and rational ism.
They argued for a synthesis and pointed to the work of Giddens (1976) and Bhaskar (1979) as
the mo st recent inf luential mov es in this direction. Halfpenny (1979) developed his schem e as
a basis for an analysis of the relationship betwe en qu alitative and quantitative data. He identified
four broad approac hes: positivist, interpretivist. ethnome thodology and structu ralist.
My category of posit iv ism is similar to empiricism and posit iv ist: interpretivism is
similar to subje ctivism and interpretivist: (with ethnom ethodology included as a sub-
type) : and realism is similar to substa ntialism and structu ralist. As the use of triangulation
has been confined to positivism and interpretivism , the realism type will receive only
limited attention , and Johns ons er a/.~ rationalist catego ry is not included in the tex t.
For a discussion of the variet ies of posit iv ism. see. for example. Halfpenny (1982) and Bryant
(1985).
*This description applies to the herme neutic and sym bolic interaction ist versions of interpretiv-
ism. but less consistently to ethnomethodology. While some analysts have kept symbolic interac-
t ionism and ethnomethodology as separate perspectives (for example, Cu ff and Payne. lY7Y:
Halfpe nny, 1979: and Bedna rz,l985), in this analysis they have been kept together on the
grounds that the differences between them are much less than between the perspectives o f
Posit iv ism, Interpretivism and Real ism.
This description is based mainly on Bhaskars work (1975. lY79). including reviews by Outhwa-
ite (1983a, 1987). Other versions o f realist social scienc e can be found in Harre (lY70. 1972,
1986), Keat and Urry (1975). Benton (1977, 1981) and Sayer (1984).
The use of triangulation in surveying assu me s positions are fixed on a horizontal plane or on
a spherical su rface. It could be argued tha t if applied within the Realist p erspe ctive. triangulation
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Triangulation 133
should oc cur vertically as it is the nature o f underlying structu res that is of conce rn. P erhaps
the analogy of depth sounding would be more a ppropriate.
Hovland (1959) has argued that di f ferences in results from experimental and survey studies
of att itude change can be accounted for in a way tha t does not require a judgment of bias of
either method. Rather, the differences were due to different definit ions of comm unication
situations and differences in the type of comm unicator, audience, and the kind of issue uti lised.
How ever, his comparisons were between different studies rather than the use of the two method s
within the same study.
IhThis is an inherent problem for the Real ist perspective. regardless of issues associated with
triangulation.
While this is not uncomm on for fol lowers of the Iowa School of symbo lic interactionism
(Douglas, 1971; Wilson, 1971: Wil l iams. 1976), i t can also be found in the method advocated
by interpretivists such as Glaser and Strauss (1967).
*The same can be said of the method of back translation used in the anthropological analysis
of tex ts or dialogue (Werner and Cam pbell, 1973: Fielding and Fielding. 1986).
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