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8/20/2019 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
#$$% & #$$'
8/20/2019 SW Quality & Reliability 112.ppt
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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.
Sept 11th 2003 Anupama.Chavan 3/24
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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$uirement.
3 vie% point ta&en into account
'(he )conomic one*manager+ vie% point'(he Socia# one*uer+ vie% point
'(he (echnica# one*deve#oper+ vie% point
Second vie% p#ay an imp ro#e a they are they rea#
uer
Sept 11th 2003 Anupama.Chavan 4/24
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B( C)MP*+(R S(M,-AR
/uality models Structured et propertie
re$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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8/20/2019 SW Quality & Reliability 112.ppt
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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
Sept 11th 2003 Anupama.Chavan /24
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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.
Sept 11th 2003 Anupama.Chavan E/24
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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 $ua#ity re#ated activitie.
ua#ity cot may be divided into
1.prevention cot
2.appraia# cot
3.fai#ure cotSept 11th 2003 Anupama.Chavan 11/24
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B( C)MP*+(R S(M,-AR
S/A activities
,ntroduction
:ariety of ta& %ith t%o contituencie they are
oft%are engineer and SA group.
:ow do enineers address quality;
:ow do S/A roup address quality;
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B( C)MP*+(R S(M,-AR
S0 /*A8,+9 0,+: 8)
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B( C)MP*+(R S(M,-AR
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B( C)MP*+(R S(M,-AR
S(5UC(U5) M NA 5A6)?M5L
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B( C)MP*+(R S(M,-AR
2AC+)RS A22(C+,-< S0 /*A8,+9 3
R(8,AB,8,+9Mver vie% %here do fai#ure come from
Sept 11th 2003 Anupama.Chavan 18/24
B( C)MP*+(R S(M,-AR
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B( C)MP*+(R S(M,-AR
)"amp#e on computer ytem error-
'5adiation monitor
'Chemica# p#ant
'Space hutt#e
'Air#ine
?hy do accident happen-'7oor and inade$uate practice
' Oot uing tate of art techni$ue
'Un$ua#ified perona#
'Changing re$uirement
'S? engineer may not undertand afety
ytem
'Sytem may not be made fai# afe
Sept 11th 2003 Anupama.Chavan 1=/24
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B( C)MP*+(R S(M,-AR
Problem sources'5e$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
Sept 11th 2003 Anupama.Chavan 1E/24
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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
Sept 11th 2003 Anupama.Chavan 20/24
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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( C)MP*+(R S(M,-AR
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