Submit Search
Upload
McCall's Quality Factors
•
Download as PPT, PDF
•
4 likes
•
10,567 views
Usman Khan
Follow
Software Quality Attributes, McCall's Quality Factors
Read less
Read more
Engineering
Report
Share
Report
Share
1 of 26
Download now
Recommended
Software quality assurance
Software quality assurance
Aman Adhikari
Ch 3 software quality factor
Ch 3 software quality factor
Kittitouch Suteeca
Software Quality Assurance
Software Quality Assurance
Siddhesh Palkar
Software testing life cycle
Software testing life cycle
Garuda Trainings
Software quality assurance
Software quality assurance
University of Sargodha
McCall Software Quality Model in Software Quality Assurance
McCall Software Quality Model in Software Quality Assurance
sundas Shabbir
Software maintenance
Software maintenance
Rajeev Sharan
SQA - chapter 13 (Software Quality Infrastructure)
SQA - chapter 13 (Software Quality Infrastructure)
uma sree
Recommended
Software quality assurance
Software quality assurance
Aman Adhikari
Ch 3 software quality factor
Ch 3 software quality factor
Kittitouch Suteeca
Software Quality Assurance
Software Quality Assurance
Siddhesh Palkar
Software testing life cycle
Software testing life cycle
Garuda Trainings
Software quality assurance
Software quality assurance
University of Sargodha
McCall Software Quality Model in Software Quality Assurance
McCall Software Quality Model in Software Quality Assurance
sundas Shabbir
Software maintenance
Software maintenance
Rajeev Sharan
SQA - chapter 13 (Software Quality Infrastructure)
SQA - chapter 13 (Software Quality Infrastructure)
uma sree
REQUIREMENT ENGINEERING
REQUIREMENT ENGINEERING
Saqib Raza
software quality
software quality
preetikapri1
Software Testing Fundamentals
Software Testing Fundamentals
Chankey Pathak
Software Evolution
Software Evolution
Muhammad Asim
Software Configuration Management (SCM)
Software Configuration Management (SCM)
Er. Shiva K. Shrestha
Software Testing Life Cycle – A Beginner’s Guide
Software Testing Life Cycle – A Beginner’s Guide
Syed Hassan Raza
Introduction to Software Review
Introduction to Software Review
Philip Johnson
System testing
System testing
Sifat Hossain
Software Devlopment Life Cycle
Software Devlopment Life Cycle
Vivek Gupta
What Is Functional Testing?
What Is Functional Testing?
QA InfoTech
Basic software-testing-concepts
Basic software-testing-concepts
medsherb
Software Testing Life Cycle
Software Testing Life Cycle
Udayakumar Sree
SDLC
SDLC
chkjha
software maintenance
software maintenance
rajshreemuthiah
Software testing & Quality Assurance
Software testing & Quality Assurance
Webtech Learning
Software quality assurance
Software quality assurance
Er. Nancy
Software test life cycle
Software test life cycle
Sumit Sinha CSM®, CSP®, EPGBM® - IIM-Calcutta
Functional Testing vs Non-Functional Testing | Edureka
Functional Testing vs Non-Functional Testing | Edureka
Edureka!
Rayleigh model
Rayleigh model
Roy Antony Arnold G
Chapter 13 software testing strategies
Chapter 13 software testing strategies
SHREEHARI WADAWADAGI
Software qualityfactors
Software qualityfactors
saira gilani
Software Quality Factors-Non Functional Rq.pptx
Software Quality Factors-Non Functional Rq.pptx
singbling
More Related Content
What's hot
REQUIREMENT ENGINEERING
REQUIREMENT ENGINEERING
Saqib Raza
software quality
software quality
preetikapri1
Software Testing Fundamentals
Software Testing Fundamentals
Chankey Pathak
Software Evolution
Software Evolution
Muhammad Asim
Software Configuration Management (SCM)
Software Configuration Management (SCM)
Er. Shiva K. Shrestha
Software Testing Life Cycle – A Beginner’s Guide
Software Testing Life Cycle – A Beginner’s Guide
Syed Hassan Raza
Introduction to Software Review
Introduction to Software Review
Philip Johnson
System testing
System testing
Sifat Hossain
Software Devlopment Life Cycle
Software Devlopment Life Cycle
Vivek Gupta
What Is Functional Testing?
What Is Functional Testing?
QA InfoTech
Basic software-testing-concepts
Basic software-testing-concepts
medsherb
Software Testing Life Cycle
Software Testing Life Cycle
Udayakumar Sree
SDLC
SDLC
chkjha
software maintenance
software maintenance
rajshreemuthiah
Software testing & Quality Assurance
Software testing & Quality Assurance
Webtech Learning
Software quality assurance
Software quality assurance
Er. Nancy
Software test life cycle
Software test life cycle
Sumit Sinha CSM®, CSP®, EPGBM® - IIM-Calcutta
Functional Testing vs Non-Functional Testing | Edureka
Functional Testing vs Non-Functional Testing | Edureka
Edureka!
Rayleigh model
Rayleigh model
Roy Antony Arnold G
Chapter 13 software testing strategies
Chapter 13 software testing strategies
SHREEHARI WADAWADAGI
What's hot
(20)
REQUIREMENT ENGINEERING
REQUIREMENT ENGINEERING
software quality
software quality
Software Testing Fundamentals
Software Testing Fundamentals
Software Evolution
Software Evolution
Software Configuration Management (SCM)
Software Configuration Management (SCM)
Software Testing Life Cycle – A Beginner’s Guide
Software Testing Life Cycle – A Beginner’s Guide
Introduction to Software Review
Introduction to Software Review
System testing
System testing
Software Devlopment Life Cycle
Software Devlopment Life Cycle
What Is Functional Testing?
What Is Functional Testing?
Basic software-testing-concepts
Basic software-testing-concepts
Software Testing Life Cycle
Software Testing Life Cycle
SDLC
SDLC
software maintenance
software maintenance
Software testing & Quality Assurance
Software testing & Quality Assurance
Software quality assurance
Software quality assurance
Software test life cycle
Software test life cycle
Functional Testing vs Non-Functional Testing | Edureka
Functional Testing vs Non-Functional Testing | Edureka
Rayleigh model
Rayleigh model
Chapter 13 software testing strategies
Chapter 13 software testing strategies
Similar to McCall's Quality Factors
Software qualityfactors
Software qualityfactors
saira gilani
Software Quality Factors-Non Functional Rq.pptx
Software Quality Factors-Non Functional Rq.pptx
singbling
Design principles & quality factors
Design principles & quality factors
Aalia Barbe
Software quality
Software quality
jagadeesan
STQA 1.pptx
STQA 1.pptx
laravoj420
SQA_Lec#01-1.ppt
SQA_Lec#01-1.ppt
Ahmad Abbas
Chapter 5 Software Quality Assurance-Finalised_BW.ppt
Chapter 5 Software Quality Assurance-Finalised_BW.ppt
Bule Hora University
Softwarequalityassurance with Abu ul hassan Sahadvi
Softwarequalityassurance with Abu ul hassan Sahadvi
AbuulHassan2
Software Testing - Software Quality
Software Testing - Software Quality
Ajeng Savitri
Software Development
Software Development
Goutama Bachtiar
Maheen soft
Maheen soft
mahshah212
sdlc.pptx
sdlc.pptx
XylemSolutions
Intoduction to software engineering part 2
Intoduction to software engineering part 2
Rupesh Vaishnav
3. quality.ppt
3. quality.ppt
AkashA993877
Testing throughout the software life cycle - Testing & Implementation
Testing throughout the software life cycle - Testing & Implementation
yogi syafrialdi
Quality Assurance in Modern Software Development
Quality Assurance in Modern Software Development
Zahra Sadeghi
Mc call's software quality model
Mc call's software quality model
Yatharth Aggarwal
SE-Unit II.pdf
SE-Unit II.pdf
AMITKUMARSINGH756828
Software Engineering Practices and Issues.pptx
Software Engineering Practices and Issues.pptx
Nikilesh8
Software Quality.pptx
Software Quality.pptx
nidhisharma887503
Similar to McCall's Quality Factors
(20)
Software qualityfactors
Software qualityfactors
Software Quality Factors-Non Functional Rq.pptx
Software Quality Factors-Non Functional Rq.pptx
Design principles & quality factors
Design principles & quality factors
Software quality
Software quality
STQA 1.pptx
STQA 1.pptx
SQA_Lec#01-1.ppt
SQA_Lec#01-1.ppt
Chapter 5 Software Quality Assurance-Finalised_BW.ppt
Chapter 5 Software Quality Assurance-Finalised_BW.ppt
Softwarequalityassurance with Abu ul hassan Sahadvi
Softwarequalityassurance with Abu ul hassan Sahadvi
Software Testing - Software Quality
Software Testing - Software Quality
Software Development
Software Development
Maheen soft
Maheen soft
sdlc.pptx
sdlc.pptx
Intoduction to software engineering part 2
Intoduction to software engineering part 2
3. quality.ppt
3. quality.ppt
Testing throughout the software life cycle - Testing & Implementation
Testing throughout the software life cycle - Testing & Implementation
Quality Assurance in Modern Software Development
Quality Assurance in Modern Software Development
Mc call's software quality model
Mc call's software quality model
SE-Unit II.pdf
SE-Unit II.pdf
Software Engineering Practices and Issues.pptx
Software Engineering Practices and Issues.pptx
Software Quality.pptx
Software Quality.pptx
More from Usman Khan
Lecture 3
Lecture 3
Usman Khan
Lecture 1
Lecture 1
Usman Khan
Keplers laws
Keplers laws
Usman Khan
Software Architecture and Design Introduction
Software Architecture and Design Introduction
Usman Khan
Ajax
Ajax
Usman Khan
Preventions of Email Hacking
Preventions of Email Hacking
Usman Khan
More from Usman Khan
(6)
Lecture 3
Lecture 3
Lecture 1
Lecture 1
Keplers laws
Keplers laws
Software Architecture and Design Introduction
Software Architecture and Design Introduction
Ajax
Ajax
Preventions of Email Hacking
Preventions of Email Hacking
Recently uploaded
(ANJALI) Dange Chowk Call Girls Just Call 7001035870 [ Cash on Delivery ] Pun...
(ANJALI) Dange Chowk Call Girls Just Call 7001035870 [ Cash on Delivery ] Pun...
ranjana rawat
main PPT.pptx of girls hostel security using rfid
main PPT.pptx of girls hostel security using rfid
NikhilNagaraju
APPLICATIONS-AC/DC DRIVES-OPERATING CHARACTERISTICS
APPLICATIONS-AC/DC DRIVES-OPERATING CHARACTERISTICS
KurinjimalarL3
Call Us -/9953056974- Call Girls In Vikaspuri-/- Delhi NCR
Call Us -/9953056974- Call Girls In Vikaspuri-/- Delhi NCR
9953056974 Low Rate Call Girls In Saket, Delhi NCR
Introduction to Multiple Access Protocol.pptx
Introduction to Multiple Access Protocol.pptx
upamatechverse
Structural Analysis and Design of Foundations: A Comprehensive Handbook for S...
Structural Analysis and Design of Foundations: A Comprehensive Handbook for S...
Dr.Costas Sachpazis
Analog to Digital and Digital to Analog Converter
Analog to Digital and Digital to Analog Converter
AbhinavSharma374939
Extrusion Processes and Their Limitations
Extrusion Processes and Their Limitations
120cr0395
The Most Attractive Pune Call Girls Budhwar Peth 8250192130 Will You Miss Thi...
The Most Attractive Pune Call Girls Budhwar Peth 8250192130 Will You Miss Thi...
ranjana rawat
HARMONY IN THE NATURE AND EXISTENCE - Unit-IV
HARMONY IN THE NATURE AND EXISTENCE - Unit-IV
RajaP95
MANUFACTURING PROCESS-II UNIT-2 LATHE MACHINE
MANUFACTURING PROCESS-II UNIT-2 LATHE MACHINE
SIVASHANKAR N
GDSC ASEB Gen AI study jams presentation
GDSC ASEB Gen AI study jams presentation
GDSCAESB
Roadmap to Membership of RICS - Pathways and Routes
Roadmap to Membership of RICS - Pathways and Routes
M Maged Hegazy, LLM, MBA, CCP, P3O
(ANVI) Koregaon Park Call Girls Just Call 7001035870 [ Cash on Delivery ] Pun...
(ANVI) Koregaon Park Call Girls Just Call 7001035870 [ Cash on Delivery ] Pun...
ranjana rawat
HARDNESS, FRACTURE TOUGHNESS AND STRENGTH OF CERAMICS
HARDNESS, FRACTURE TOUGHNESS AND STRENGTH OF CERAMICS
RajkumarAkumalla
Sheet Pile Wall Design and Construction: A Practical Guide for Civil Engineer...
Sheet Pile Wall Design and Construction: A Practical Guide for Civil Engineer...
Dr.Costas Sachpazis
High Profile Call Girls Nagpur Isha Call 7001035870 Meet With Nagpur Escorts
High Profile Call Girls Nagpur Isha Call 7001035870 Meet With Nagpur Escorts
ranjana rawat
Porous Ceramics seminar and technical writing
Porous Ceramics seminar and technical writing
rakeshbaidya232001
Software Development Life Cycle By Team Orange (Dept. of Pharmacy)
Software Development Life Cycle By Team Orange (Dept. of Pharmacy)
Suman Mia
Exploring_Network_Security_with_JA3_by_Rakesh Seal.pptx
Exploring_Network_Security_with_JA3_by_Rakesh Seal.pptx
null - The Open Security Community
Recently uploaded
(20)
(ANJALI) Dange Chowk Call Girls Just Call 7001035870 [ Cash on Delivery ] Pun...
(ANJALI) Dange Chowk Call Girls Just Call 7001035870 [ Cash on Delivery ] Pun...
main PPT.pptx of girls hostel security using rfid
main PPT.pptx of girls hostel security using rfid
APPLICATIONS-AC/DC DRIVES-OPERATING CHARACTERISTICS
APPLICATIONS-AC/DC DRIVES-OPERATING CHARACTERISTICS
Call Us -/9953056974- Call Girls In Vikaspuri-/- Delhi NCR
Call Us -/9953056974- Call Girls In Vikaspuri-/- Delhi NCR
Introduction to Multiple Access Protocol.pptx
Introduction to Multiple Access Protocol.pptx
Structural Analysis and Design of Foundations: A Comprehensive Handbook for S...
Structural Analysis and Design of Foundations: A Comprehensive Handbook for S...
Analog to Digital and Digital to Analog Converter
Analog to Digital and Digital to Analog Converter
Extrusion Processes and Their Limitations
Extrusion Processes and Their Limitations
The Most Attractive Pune Call Girls Budhwar Peth 8250192130 Will You Miss Thi...
The Most Attractive Pune Call Girls Budhwar Peth 8250192130 Will You Miss Thi...
HARMONY IN THE NATURE AND EXISTENCE - Unit-IV
HARMONY IN THE NATURE AND EXISTENCE - Unit-IV
MANUFACTURING PROCESS-II UNIT-2 LATHE MACHINE
MANUFACTURING PROCESS-II UNIT-2 LATHE MACHINE
GDSC ASEB Gen AI study jams presentation
GDSC ASEB Gen AI study jams presentation
Roadmap to Membership of RICS - Pathways and Routes
Roadmap to Membership of RICS - Pathways and Routes
(ANVI) Koregaon Park Call Girls Just Call 7001035870 [ Cash on Delivery ] Pun...
(ANVI) Koregaon Park Call Girls Just Call 7001035870 [ Cash on Delivery ] Pun...
HARDNESS, FRACTURE TOUGHNESS AND STRENGTH OF CERAMICS
HARDNESS, FRACTURE TOUGHNESS AND STRENGTH OF CERAMICS
Sheet Pile Wall Design and Construction: A Practical Guide for Civil Engineer...
Sheet Pile Wall Design and Construction: A Practical Guide for Civil Engineer...
High Profile Call Girls Nagpur Isha Call 7001035870 Meet With Nagpur Escorts
High Profile Call Girls Nagpur Isha Call 7001035870 Meet With Nagpur Escorts
Porous Ceramics seminar and technical writing
Porous Ceramics seminar and technical writing
Software Development Life Cycle By Team Orange (Dept. of Pharmacy)
Software Development Life Cycle By Team Orange (Dept. of Pharmacy)
Exploring_Network_Security_with_JA3_by_Rakesh Seal.pptx
Exploring_Network_Security_with_JA3_by_Rakesh Seal.pptx
McCall's Quality Factors
1.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 1 Chapter 3 Software Quality Factors
2.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 2 • The need for comprehensive Software Quality Requirements • Classification of requirements into Software Quality Factors • Product Operation Factors • Product Revision Factors • Product Transition Factors • Alternative models of software quality factors • Who is interested in defining quality requirements? • Software compliance with Quality Factors Chapter ThreeChapter Three Software Quality Factors
3.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 3 The Requirements Document • Requirement Documentation (Specification) is one of the most important elements for achieving software quality • Need to explore what constitutes a good software requirements document. • Some SQA Models suggest 11-15 factors categorized; some fewer; some more • Want to become familiar with these quality factors, and • Who is really interested in them. • The need for comprehensive software quality requirements is pervasive in numerous case studies (see a few in this chapter). • (Where do the quality factors go??)
4.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 4 Need for Comprehensive Software Quality Requirements • Need for improving poor requirements documents is widespread • Frequently lack quality factors such as: usability, reusability, maintainability, … • Software industry groups the long list of related attributes into what we call quality factors. (Sometimes non-functional requirements) • Natural to assume an unequal emphasis on all quality factors. • Emphasis varies from project to project – Scalability; maintainability; reliability; portability; etc. • Let’s look at some of the categories…
5.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 5 Extra Thoughts • Seems like in Software Engineering we concentrate on capturing, designing, implementing, and deploying with emphasis on functional requirements. • Little (not none!) emphasis on the non-functional requirements (quality factors). • More and more emphasis now placed on quality factors • Can be a critical factor in satisfying overall requirements. • In the RUP, non-functional requirements are captured in the Software Requirements Specification (SRS); functional requirement usually captured in Use Case stories.
6.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 6 McCall’s Quality Factors • McCall has 11 factors; Groups them into categories. – 1977; others have added, but this still prevail. • Three categories: – Product Operation Factors • How well it runs…. • Correctness, reliability, efficiency, integrity, and usability – Product Revision Factors • How well it can be changed, tested, and redeployed. • Maintainability; flexibility; testability – Product Transition Factors • How well it can be moved to different platforms and interface with other systems • Portability; Reusability; Interoperability • Since these underpin the notion of quality factors and others who have added, reword or add one or two, we will spend time on these factors.
7.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 7 Software quality factors Product operation factorsProduct revision factorsProduct transition factors McCall's software quality factors model
8.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 8 McCalls factor model tree
9.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 9 • Correctness • Reliability • Efficiency • Integrity • Usability Product operation factors How well does it run and ease of use.
10.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 10 McCall’s Quality Factors Category: Product Operation Factors • 1. Correctness. • Please note that we are asserting that ‘correctness’ issues are arising from the requirements documentation and the specification of the outputs… • Examples include: – Specifying accuracies for correct outputs at, say, NLT <1% errors, that could be affected by inaccurate data or faulty calculations; – Specifying the completeness of the outputs provided, which can be impacted by incomplete data (often done) – Specifying the timeliness of the output (time between event and its consideration by the software system) – Specifying the standards for coding and documenting the software system – we have talked about this: standards and integration; Essential!!
11.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 11 McCall’s Quality Factors Category: Product Operation Factors • 2. Reliability Requirements. (remember, this quality factor is specified in the specs!) • Reliability requirements deal with the failure to provide service. – Address failure rates either overall or to required functions. • Example specs: – A heart monitoring system must have a failure rate of less than one per million cases. – Downtime for a system will not be more than ten minutes per month (me) – MTBF and MTTR - old and engineering, but still applicable. • 3. Efficiency Requirements. Deals with the hardware resources needed to perform the functions of the software. – Here we consider MIPS, MHz (cycles per second); data storage capabilities measured in MB or TB; communication lines (usually measured in KBPS, MBPS, or GBPS). – Example spec: simply very slow communications…
12.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 12 McCall’s Quality Factors Category: Product Operation Factors • 4. Integrity – deal with system security that prevent unauthorized persons access. • Huge nowadays; Cyber Security; Internet security; network security, and more. These are certainly not the same! • 5. Usability Requirements – deals with the scope of staff resources needed to train new employees and to operate the software system. – Deals with learnability, utility, usability, and more. (me) – Example spec: A staff member should be able to process n transactions / unit time. (me)
13.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 13 • Maintainability • Flexibility • Testability Product revision factors Can I fix it easily, retest, version it, and deploy it easily?
14.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 14 McCall’s Quality Factors Category: Product Revision Software Factors• These deal with requirements that affect the complete range of software maintenance activities: – corrective maintenance, – adaptive maintenance, and – perfective maintenance – KNOW THE DIFFERENCES! • 1. Maintainability Requirements – The degree of effort needed to identify reasons (find the problem) for software failure and to correct failures and to verify the success of the corrections. – Deals with the modular structure of the software, internal program documentation, programmer manual, architectural and detail design and corresponding documentation – Example specs: size of module <= 30 statements. – Refactoring...
15.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 15 McCall’s Quality Factors Category: Product Revision Software Factors • 2. Flexibility Requirements – deals with resources to change (adopt) software to different types of customers that use the app perhaps a little differently; – May also involve a little perfective maintenance to perhaps do a little better due to the customer’s perhaps slightly more robust environment. – Different clients exercise software differently. This is big! • 3. Testability Requirements – – Are intermediate results of computations predefined to assist testing? – Are log files created? Backup? – Does the software diagnose itself prior to and perhaps during operations?
16.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 16 • Portability • Reusability • Interoperability Product transition factors Can I move the app to different hardware? Interface easily with different hardware / software systems; can I reuse major portions of the code with little modification to develop new apps?
17.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 17 McCall’s Quality Factors Category: Product Transition Software Quality Factors • 1. Portability Requirements: If the software must be ported to different environments (different hardware, operating systems, …) and still maintain an existing environment, then portability is a must. • 2. Reusability Requirements: Are we able to reuse parts of the app for new applications? – Can save immense development costs due to errors found / tested. – Certainly higher quality software and development more quickly results. – Very big deal nowadays.
18.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 18 McCall’s Quality Factors Category: Product Transition Software Quality Factors • 3. Interoperability Requirements: Does the application need to interface with other existing systems –Frequently these will be known ahead of time and plans can be made to provide for this requirement during design time. • Sometimes these systems can be quite different; different platforms, different databases, and more –Also, industry or standard application structures in areas can be specified as requirements.
19.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 19 Alternatives • Some other SQA professionals have offered essentially renamed quality factors. • One has offered 12 factors; another 15 factors. • Totally five new factors were suggested • Evans and Marciniak offer two ‘new’ ones: – Verifiability and Expandability • Deutsch and Willis offer three ‘new’ ones. – Safety – Manageability, and – Survivability
20.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 20 McCall's factor model and alternative models
21.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 21 Alternatives Evans and Marciniak offer Verifiability and Expandability – 1. Verifiability Requirements addresses design and programming features that allow for efficient verification of design and programming; • This does not refer to outputs; rather, structure of code; design elements and their dependencies, coupling, cohesion; patterns… – apply to modularity, simplicity, adherence to documentation and programming guidelines, etc. – Look at the UML for dependencies, cohesion, coupling… – 2. Expandability Requirements really refers to scalability and extensibility to provide more usability. • Essentially this is McCall’s flexibility
22.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 22 Alternatives Deutsch and Willis offer Safety, Manageability, and Survivability – 1. Safety Requirements address conditions that could bring the equipment or application down especially for controlling software, as in setting alarms or sounding warnings. •Especially important to process control / real time software such as that running conveyor belts or instrumentation for ordinance… – 2. Manageability Requirements refer to tools primarily administrative to control versions, configurations and change management / tracking. •We must have tools to manage versions and various configurations that may vary from customer to customer. – 3. Survivability Requirements refer to MTBF, or continuity of service, as well as MTTR (mean time to recover). • Appears to be quite similar to Reliability in McCall’s model
23.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 23 Comparisons • These all are pretty close. • Both models do add Verifiability, • I like this one; addresses design and programming. (programming conventions / standards, etc.) – As we have developed as a discipline, I think this is essential. • Safety is clearly important as computers control more and more of what we do especially in both hardware and in software. – New cars will now sound an alarm as we back up; software will sound when power is interrupted. This is important.
24.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 24 So, Who Cares? • Both developers and clients need to care. One group may care more than the other for certain quality factors. • Certainly the nature of the app dictates more concern on some of these factors than others (safety, for example) • In the Rational Unified Process, we call this component of the requirements the SRS (software requirement specifications, which contains these ‘non-functional requirements’ which are requirements in every sense of the word – just not functional requirements, as the term is normally used. • What are your feelings about these quality factors?
25.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 25 Homework #3 You may work alone or with one student on this assignment: •1. Please address each of the McCall’s quality factors and address how each apply to software and/or hardware (not using the examples in the chapter). Please add verifiability and safety. – Develop a short paper in Word that has no less than a single paragraph addressing each of these quality factors. (This may take a two pages) – Table 3.3 may provide some assistance. •2. Answer question 3.2 •Due: Next Wednesday no later than (NLT) 4pm via Blackboard.
26.
Galin, SQA from
theory to implementation © Pearson Education Limited 2004 26 Team Discussion • Team 3 is to lead the discussion on the following questions: • You must summarize the main points in the chapter, and lead discussions on: • 3.3 • 3.4 • 3.5
Download now