SW Quality & Reliability 112.ppt

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Seminar Presentationon

Software quality and reliability

Under the guidance of

Mr. B.R.Mandre

Submitted byAnupama.A.Chavan Department of computer enineerin

S.S.!.P.S B.S.Deore Collee of enineerin" Dhule

#$$% & #$$'


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B( C)MP*+(R S(M,-AR

,-+R)D*C+,)-+he term 6quality 7 miht seem self&e4planatory there are

many views of what quality mean.

/uality is a dynamic attribute.

Reliability of computer is an important element for its

overall quality.

Software reliability is the probability of software product

operatin in a particular environment without e4hibitin

failures.Software quality and reliability is an umbrella activity for

improvin software.

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B( C)MP*+(R S(M,-AR

S)2+0AR( /*A8,+9I the !Conformance to e"p#icit#y tated functiona#

and performance re$uirement.

3 vie% point ta&en into account

'(he )conomic one*manager+ vie% point'(he Socia# one*uer+ vie% point

'(he (echnica# one*deve#oper+ vie% point

Second vie% p#ay an imp ro#e a they are they rea#

uer



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B( C)MP*+(R S(M,-AR

/uality models Structured et propertie

re$uired for an ob,ect c#a to meet defined purpoe

(he bet e.g.-ohem+ mode#

I !hierarchy of $ua#ity metric.

(he mode# imp#ie

1. o %hat uer %hat

2. Ue computer reource correct#y

3. e eay for uer to #earn and ue

4. e %e##*deigned %e##*coded eai#y tetedand maintained

•

Sept 11th 2003 Anupama.Chavan /24


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B( C)MP*+(R S(M,-AR /uality factor

actor affecting oft%are $ua#ity are ca##ed $ua#ity

factor

ua#ity factor are-

'5e#iabi#ity

')fficiency

'Integrity

'Uabi#ity

'6aintabi#ity

'#e"ibi#ity

'7ortabi#ity'5euabi#ity

'Correctne

'Interoperabi#ity



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B( C)MP*+(R S(M,-AR

/uality factor calculation

Intrument needed to ca#cu#ate $ua#ity factor-

'uetioner

'A #it of tab#e

A i" tep procedure for ca#cu#ating $ua#ity factor-'6ot important i $ua#ity ub characteritic determination

'Sing#e characteritic priority determination

'Characteritic %eight aignment

'Sum of ub characteritic va#ue 9SC:;'Characteritic va#ue 9C:; ca#cu#ation

'(ota# characteritic ca#cu#ation 9(C:;

< (C: / (C: 9ma";

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B( C)MP*+(R S(M,-AR

S)2+0AR( M(+R,CS It refer to meaurement criteria for computer oft%are.

+ypes of software metrics

1.7roce metric-5ationa# %ay to improve any proce.

)nab#e manger and practitioner %hat %or& and doen>t.

(o provide indicator that #ead to #ong term S? proce deve#opment

2.7ro,ect metric-Ue for trategic purpoe

)nab#e pro,ect manager do variou ta&

Ued to minimi@e deve#opment chedu#e

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B( C)MP*+(R S(M,-AR

S)2+0AR( R(8,AB,8,+9

Introduction-

efined a !the probabi#ity of fai#ure free operation.

It+ importance-'(remendou gro%th in ue of oft%are contro# ytem

'Ued to contro# critica# #ife upport

'Bac& of dicip#ine in generating oft%are

'Soft%are accident due to oft%are prob#em

'emand for oft%are i gro%ing 2 per year

'Unatifactory return on oft%are invetment'Digh cot defect

'7oor $ua#ity product and #o% repone to cutomer need

'Bo% avai#abi#ity

'Bac& of ecurity / fau#t protection.

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B( C)MP*+(R S(M,-AR

6eauring S? re#iabi#ity and avai#abi#ity

6eaure of re#iabi#ity i mean F bet%een * fai#ure

6( < 6(( G 6((5

?here 6(( H 6((5 are mean*time*to*fai#ure andmean*time*to*repair.

Soft%are avai#abi#ity i given a

Avai#abi#ity


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B( C)MP*+(R S(M,-AR

S)2+0AR( /*A8,+9 ASS*RA-C(

IntroductionSA activity i a management activity.

SA improve oft%are $ua#ity.

5eferred to a !the eye of cutomer.

ua#ity auranceConit of auditing and reporting function of management.

(he goa# of SA i to provide management %ith neceary

data.

Cot of $ua#ityInc#ude a## cot in performing $ua#ity re#ated activitie.

ua#ity cot may be divided into

1.prevention cot

2.appraia# cot

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B( C)MP*+(R S(M,-AR

S/A activities

,ntroduction

:ariety of ta& %ith t%o contituencie they are

oft%are engineer and SA group.

:ow do enineers address quality;

:ow do S/A roup address quality;



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S0 /*A8,+9 0,+: 8)


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B( C)MP*+(R S(M,-AR

S(5UC(U5) M NA 5A6)?M5L



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B( C)MP*+(R S(M,-AR

2AC+)RS A22(C+,-< S0 /*A8,+9 3

R(8,AB,8,+9Mver vie% %here do fai#ure come from


B( C)MP*+(R S(M,-AR


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B( C)MP*+(R S(M,-AR

)"amp#e on computer ytem error-

'5adiation monitor

'Chemica# p#ant

'Space hutt#e

'Air#ine

?hy do accident happen-'7oor and inade$uate practice

' Oot uing tate of art techni$ue

'Un$ua#ified perona#

'Changing re$uirement

'S? engineer may not undertand afety

ytem

'Sytem may not be made fai# afe

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B( C)MP*+(R S(M,-AR

Problem sources'5e$uirement and pecification

'eign

'Coding

'Integration

'6anufacture



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B( C)MP*+(R S(M,-AR

+))8S +) ,MPR)!( S)2+0AR( /*A8,+9

A-D R(8,AB,8,+9Soft%are modu#e / Soft%are reue

itributed rea# time ytem

6u#tip#e voting ytem6i" of programming &i## H e"perience

Ana#og inter#oc&

Ana#og bac&upSoft%are fau#t detection

Soft%are deve#opment pecification

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B( C)MP*+(R S(M,-AR

S0 /*A8,+9 A-D R(8,AB,8,+9 2)R-(@+ 5$ 9(ARS

rom bi##on of connected ytem to bi##on

and beyond

rom machine centered to human centered

oft%are

(he future of re#iabi#ity



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B( C)MP*+(R S(M,-AR

C)-C8*S,)-

Software is used in critical applications

Software is wea1 lin1 in the system safety reliability

Potential problems with software are not well understood

+here are many ways to validate and improve software

/uality is a many splendoted thin and every improvementof its attributes is at once an advance and an advantae



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B,B8,)


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B( C)MP*+(R S(M,-AR

/*(S+,)-S



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+:A-= 9)*

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B( C)MP*+(R S(M,-AR

SW Quality & Reliability 112.ppt

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