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Software Engineering
Session By
Dr. Manojkumar V. DeshpandeProfessor & Associate Dean
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Differentiate Software and Program
What do you mean Quality ?
What is Green, Blue and Red Money ?
3/4/2013 Dr.Manojkumar Deshpande,SVKMs NMIMS, Shirpur Campus
2
Quiz
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Quality Attributes / Factor
quality attribute : A feature or characteristicthat affects an
item's quality. Syn: qualityfactor. Note: In a hierarchy of
qualityattributes, higher level attributes may becalled quality
factors, lower level attributescalled quality attributes.
quality factor quality attribute. Note: In a
hierarchy of quality attributes, higher levelattributes may be
called quality factors, lowerlevel attributes called quality
attributes.
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McCalls Triangle of Quality
Ma in ta in a b ilityMa in ta in a b ilityF le x ib ilityF le x
ib ility
T e s ta b ilityT e s ta b ility
P o rta b ilityP o rta b ility
R e u s a b ilityR e u s a b ility
I n te ro p e ra b ilityI n te ro p e ra b ility
C o rre c tn e s sC o rre c tn e s s
R e lia b ilityR e lia b ility
E ffic ie n c yE ffic ie n c y
I n te g rityI n te g rity
U s a b ilityU s a b ility
P R O D U C T T R A N S I T I O NP R O D U C T T R A N S I T I O
NP R O D U C T R E V I S I O NP R O D U C T R E V I S I O N
P R O D U C T O P E R A T I O NP R O D U C T O P E R A T I O
N
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Correctness : The Extent to which a program satisfiesits
specification and fulfills the customers missionobjective
Reliability :The Extent to which program can be
expected to perform its intended function withrequired
precision
Efficiency : The amount of computing resources andcode required
by a program to perform its function
Integrity : The extent to which access to software ordata by
unauthorized person can be controlled
Usability: The effort required to learn operate andprepare input
for and interpret output of a program
Product Operation (CREIU)
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Product Transition (PRI)
Portability : Effort required to transferprogram from one
hardware software system
to another
Reusability : The extent to which a programcan be reused in
other application
Interoperability :The effort required to couple
one system to another
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Product Revision (MFT)
Maintainability : The effort required to locateand fix an error
in program
Flexibility : Effort required to modify the
program Testability : The effort required to test a
program to ensure that it performs intendedfunction
PRODUCT : O T R
QUALITY FACTORS : CREIUPRIMFT
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ISO 9126 Quality Factors
Functionality. The degree to which the softwaresatisfies stated
needs as indicated by thefollowing subattributes: suitability,
accuracy,interoperability, compliance, and security.
Reliability. The amount of time that the softwareis available
for use as indicated by the followingsubattributes : maturity,
fault tolerance,recoverability.
Usability. The degree to which the software iseasy to use as
indicated by the followingsubattributes: understandability,
learnability,operability.
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ISO 9126 Quality Factors
Efficiency. The degree to which the software makesoptimal use of
system resources as indicated by thefollowing subattributes: time
behavior, resourcebehavior.
Maintainability. The ease with which repair may bemade to the
software as indicated by the followingsubattributes: analyzability,
changeability, stability,testability.
Portability. The ease with which the software can betransposed
from one environment to another asindicated by the following
subattributes: adaptability,installability, conformance,
replaceability.
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Exercise
How McCalls quality factors are applicable toMobile Phone
Software ?
PRODUCT : O T R
QUALITY FACTORS : CREIUPRIMFT
List ISO 9126 : Quality Factor and
subattributes
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Questions ?
Thank You !!!Wishing you happy Teaching
and Learning !!!
