© 2008 Grigori Melnik · XP/Agile Universe + ADC series = Agile Conference − annual, since 2001,...
Transcript of © 2008 Grigori Melnik · XP/Agile Universe + ADC series = Agile Conference − annual, since 2001,...
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© 2008 Grigori Melnik
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…
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The Issue …
Do agile methods work because of
their engineering and management
practices or because the people who
introduce them are simply very good
developers ?
Understanding a discipline demands
observation, model building, and experimentation.
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The State of the Practice
Largely measurement-free zone− Few experiments
− Even fewer published results
− Minimal focus on data collection
− Existing data is often incomplete or tainted
− High-profile consultants provide anecdotal evidence
Existing experiments
− Either too trivial
− Or have experimental design flaws
Vast number of human interaction variables that cannot be controlled
Small samples
Non-practitioners as subjects
Conducted over short time
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Experience Reports are Situational
The soundness of an idea (process, technique etc.) is
not absolute
Context-specific!
Cross-project comparison is very difficult
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Evidence shows
Agile is entering the mainstream
Teams practicing agile are getting larger and more
distributed
Agile self-organizing teams report higher job satisfaction
Agile is not just developer-centric
Rational design decision-making
Testing to the forefront of development
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AGILE ADOPTION –
WELCOME TO MAINSTREAM
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The Story of Agile
2000-2001 Suitable contexts
2002 Scalability
2003 Adaptability
2004 Methodologies zoo
2005 Convergence
2006-2007 Entering mainstream
2008-… Agile v2
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Agile Adoption (Methods & tools, May 2005)
At what stage is the agile approach
(XP, Scrum, FDD, ...) adoption at your location?
− Not aware 26%
− Not using 16%
− Investigating 14%
− Analysed and rejected 3%
− Pilot projects 4%
− Partial implementation
(adoption of some agile practices) 17%
− Partial deployment
(some projects are using this approach) 12%
− Deployed
(all new projects are using this approach) 8%
N=232, Selection bias
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41%
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Agile Adoption (Forrester, Sep 2006)
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NB: - not just software companies;
- large companies (>1,000 employees)
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IEEE Software Blitz Perception Survey (Erdogmus 2007)
NB: N=150, selection bias
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Professional conferences
XP/Agile Universe + ADC series = Agile Conference− annual, since 2001, (230 attendees)
− 2007 (1,200 attendees)
− 2008 (1,700 attendees expected, with 400 presenters!)
European XP conference− since 2002, annual
Many XP Days and AgileOpen around the world
OOPSLA− becoming more and more agile context-rich
− merger?
Agile Development Conference (SQE)− new, commercial, still gets 400+ attendees
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In Academia…
www.computer.org/education/cc2001/SE2004Volume.pdf
• Include "agile methods"
as Essential in both
Software Life Cycles
course and Project
Management course
• Individual practices:
– refactoring (E)
– test-first design (D)
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Agile Adoption Rates
Increase With Company Size
N=911, Nov 2005
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Number of Agile Projects Run (Ambler 2007)
64
194
82
30
57
1
2 to 5
5 to 10
10 to 20
20+
N=427, Mar 2007
http://www.ddj.com/architect/200001986
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Value Realized (VersionOne 2006, 2007)
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N=722, Jul 2006
VersionOne
Global Survey
N=1,700, Jul 2007
VersionOne
2nd Global Survey
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Boeing Case Study (Bedoll 2003)
Critical system: Boeing Commercial Airplane Electrical design
First project – Tayloristic, heavy-weight
− “invested 60 man-years, and failed”
Second project – Agile
− “invested 4 man-years, and continues to be dramatically successful”
Aspect Success, Agile Failure, Tayloristic
Business Process The tool evolves incrementally, along with the
business process.
The process is build after the tool is done, or the
tool is created using imagined business process.
Customer Involvement Daily contact and hands-on evaluation of new-
feature code by the users within days of
requirements definition.
Monthly paper-design reviews, and hands-on
feature evaluation by the users nine months after
requirements.
Simplicity and Focus A single group of 60 users; a single airplane
program with a small set of airplanes.
2000 users, all five airplane programs with all
airplanes past, present, future (several thousand
planes).
Development Tools and
Processes
ACCESS, SQL Server, Visual Basic, lean
development processes (but still a formal
testing and release process)
C++, Motif, heavy-weight, paper-intensive
development processes.
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Key Agile Practices (VersionOne 2007)
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N=1,700
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Key Agile Methodologies (VersionOne 2007)
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N=1,700
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Moore, G. Crossing the Chasm, 1991, 1999, 2002
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Have Agile Methods Crossed the Chasm Yet?
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Agile Adoption By Industry
N=911, Nov 2005
Lloyds Bank Insurance
Telus
Tradeco
CP Rail
Capital One
Sample case studies
BBC
ABB
HP
Microsoft
Primavera
Transcanada Pipelines
Hydro Aluminum
Ohio Student Loans
Industry Canada
Tesco
Caterpillar
Petro Canada
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AGILE = HAPPY TEAMS ?
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Effects on Job Satisfaction and Turnover
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Who cares?
happy teams productive teams
happy teams lower turnover
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Who cares?
happy teams productive teams
happy teams lower turnover
considerable economic effect:turnover costs 70%-200% of employee’s
annual salary (e.g. Meta Group Report)
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Job Satisfaction (Melnik/Maurer 2005)
11.0%
7.6%
25.0%
29.8%
8.5%
11.0%
21.4%
7.9%
35.0%
31.3%
53.2%
18.0%
9.9%
29.4%
0.9%
IT General(ComputerWorldStudy, N2=936)
Non-agile (main study)
Agile
(main study,
N1=459)
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Results: Overall Satisfaction by Job Roles and
Levels of Agile Experience (N=482)
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Technology
Expert
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Sustainable Pace (Mann/Maurer 2005)
2 year longitudinal case study
Researcher embedded in small development team
Scrum is introduced
Overall results:− Reduced
overtime
− Increased
customer
satisfaction
Average Percent Overtime Worked By Team
-20.00
0.00
20.00
40.00
60.00
80.00
100.00
01-0
5-2
003
02-0
9-2
003
03-1
6-2
003
04-2
0-2
003
05-2
5-2
003
06-2
9-2
003
08-0
3-2
003
09-0
7-2
003
10-1
2-2
003
11-1
6-2
003
12-2
1-2
003
01-2
5-2
004
02-2
9-2
004
04-0
4-2
004
05-0
9-2
004
06-1
3-2
004
07-1
8-2
004
08-2
2-2
004
09-2
6-2
004
10-3
1-2
004
12-0
5-2
004
01-0
9-2
005
02-1
3-2
005
Week
%
Ho
urs
Overt
ime
Scrum Introduced
New Windows
App Release
Website Release
Windows App 1 support and
Windows App 2
Development
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MODELING & DESIGN
DECISION MAKING
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Design Decision Making
in Small Agile Teams (Zannier/Maurer 2006)
Rational = consequential choice
− Concurrent comparison of tradeoffs
Naturalistic = sequential evaluation
− No tradeoffs
Qualitative study (action research)
− 3 companies, 23 developers
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On Design (Ambler 2007)
93% of agile teams do whiteboard modeling
77% of agile teams do some requirements envisioning
up front
77% of agile teams also do a bit of architectural
envisioning up front
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N=427
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TEST-DRIVEN DEVELOPMENT
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Test-Driven Development (Industry Subjects)
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…
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Test-Driven Development (Academic Subjects)
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TDD in Non-Trivial Contexts
IEEE Software May/June 2007:
Control systems design
GUI development
Database development
Incorporating performance
testing in TDD
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How do business and technology experts
utilize STDD in the software development
lifecycle?
What kinds of benefits and limitations
does STDD manifest?
Acceptance Testing and Storytest-Driven
Development
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Acceptance Testing and Storytest-Driven
Development – Understandability
Melnik/Read/Maurer 2005:
Technology Experts’ Perspective (N=12/42)
Melnik/Maurer/Chiasson 2006:
Technology Experts’ Perspective (N=9/22)
Melnik 2006, 2007: 2 Field Studies
Can executable acceptance tests
describing customer requirements be
easily understood and implemented by a
technology expert with no background in
STDD?
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Acceptance Test Authoring
Are business experts (pairs) on agile projects
capable of
effectively
authoring their
functional requirements
in the form of
executable acceptance tests (storytests)
and communicating those
to the development team?
“good” acceptance tests:
- credible;
- appropriate complexity;
- coverage of major functionality;
- easy to read.
Source: Melnik/Chiasson/Maurer 2006:
Business Experts’ Perspective (N=9/18 + 9/22)
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Acceptance Testing and Storytest-Driven
Development
Storytest-driven development stimulates thinking and is
correlated with enhanced communication about
requirements in software teams
Executable acceptance test specifications can serve as
sufficient evidence of requirements traceability
Weak tool support presents a serious limitation and effects
maintainability and scalability
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Introducing p&p Acceptance Testing
Guidance series
1) Acceptance testing fundamentals
2) Test automation and test patterns
3) Acceptance test-driven development – tool support
http://codeplex.com/TestingGuidance
Call for participation: Online Survey!
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Summary (do, reflect, learn!)
Welcome to the mainstream!
Experience reports and case studies are valuable
Teams practicing agile are getting larger and more
distributed
Agile teams report higher job satisfaction
Agile is not just developer-centric
Initial evidence of rational design decision-making
Testing to the forefront of development
Need to go beyond surveys and do more experimentation
Do your own pilot projects to− generate support for future agile initiatives
− learn what works
− play with new ideas by encouraging innovation and risk taking
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Agile 2008 – Expanding Agile Horizons
Agile 2008 World Conference
August 4-8, 2008
Toronto, Canada
www.agile2008.org