SQuaRE (Software Product Quality Requirement and Evaluation) Architecture

SQuaRE(Software Product Quality Requirement and Evaluation) Architecture

2005-10-20

Lee, Keumsuk

(kslee@dongguk.edu)

Dept. of Computer and Multimedia Engineering,

Dongguk University

 

2005-10-20

 

Outline

 

• Introduction to Software Quality

• Software Quality Model

• ISO/IEC 9126 Software Product Quality

• ISO/IEC 14598 Software Product Evaluation

• ISO/IEC 25000 SQuaRE Architecture

• Summary

• References

 

What is Quality?

• Quality:

“(1) The degree to which a system, component, or a process meets specified requirements. (2) The degree to which a system, component, or process meets customer or user needs or expectations” (IEEE Std. 610-12-1990)

“The totality of characteristics of an entity that bear on its ability to satisfy stated and implied needs” (ISO 8402, 1994)

 

What is Software Product Quality?

• Software Product:

“Set of computer programs, procedures, possibly associated document and data”(ISO/IEC 12207:1995)

• Software Quality:

“Capability of software product to satisfy stated and implied needs when used under specified conditions” (ISO/IEC 14598-1) ->

(1) conformance to requirements

(2) measure of user satisfaction

 

Software Quality Aspects

• The written requirements should accurately and completely represent the needs and expectation of the users.

 

Why Measuring and Evaluating Software Products

• Resources and Capability Quality

– In order to go the goal place fast and comfortable, a good car and a skilled driver are key to success.

• Process Quality

– In order to go to the goal place efficiently, good drive map and guides are necessary.

• Product Quality

– You cannot guide the way to the goal if you don’t know where you are.

 

Software Quality Models

• Quality model:

“The set of characteristics and the relationships between them which provides a framework for specifying requirements and evaluating quality” (ISO/IEC 14598-1)

• Well-known quality models

– Boehm’s model(1976)

– McCall’s model(1977)

– ISO/IEC 9126 model(1991)

 

Framework for Quality Model

• A hierarchical structure

ISO/IEC JTC1/SC7/WG6

Evaluation and Metrics

• History

– Original idea proposed in 1978 at Stockholm Meeting.

– Project initiated in 1985 at Stockholm Meeting.

• Output

– ISO/IEC 9126 , 1991 : Information technology - Software product evaluation – Quality characteristics and guidelines for their use

– ISO/IEC 12119 , 1994 : Information technology - Software packages - Quality Requirement and testing

 

Evolution of ISO/IEC 9126

 

International Standards by SC7/WG6

 

ISO/IEC 9126: Software Product Quality

• Part 1: Quality Model

• Part 2: External Metrics

• Part 3: Internal Metrics

• Part 4: Quality in Use Metrics

ISO/IEC 14598: Software Product Evaluation

• Part 1: General Overview

• Part 2: Planning and Management

• Part 3: Process for Developers

• Part 4: Process for Acquirers

• Part 5: Process for Evaluators

• Part 6: Documentation of Evaluation Module

 

ISO/IEC 9126-1

Software Quality Model Framework

• Quality in the life cycle

ISO/IEC 9126-1

Software Quality Model

• ISO/IEC 9126 model consists of two parts.

– A model for External and Internal Software Quality

– A model for Quality in Use

 

External Quality and Internal Quality

• External Quality

– The extent to which a product satisfies stated and implied needs when used under specified conditions (ISO/IEC 14598-1)

• Internal Quality

– The totality of attributes that determine its ability to satisfy stated and implied needs when used under specified condition. (ISO/IEC 14598-1)

 

Quality In Use Definition

• The extent to which a product used by specified users meets their needs to achieve specified goals with effectiveness, productivity and satisfaction in specified context of use. (ISO/IEC 14598-1)

 

ISO/IEC 14598-1 Evaluation Process

 

 

Product Evaluation Planing

 

• Major Items of a Evaluation Plan (ISO/IEC 14598-2)

– Project Objectives

– Applicable quality characteristics

– List of Priority

– Quality Objectives

– Schedules

– Definition of Responsibilities

– Measurement Categories

– Using and Analyzing Data

– Reporting

 

Guidance and Requirements for Evaluation Process

 

• ISO/IEC 14598-3:

– Process for development of a new product or enhancement of an existing one

• ISO/IEC 14598-4:

– Process for acquisition or reusing of an existing or predeveloped software product

• ISO/IEC 14598-5:

– Process for independent evaluation including third-party assessment

 

Problems of the 9126 & 14598 series

• Existence of two series and inconsistency among them caused by the building block

approach

• Needs for total view of product quality

• Needs for map and guide for the series

• Needs for Quality Requirement standard

• Needs for umbrella standard on metrics

– TR at current stage

– Duplication of the common part

 

ISO/IEC 25000 SQuaRE series

• Organization of SQuaRE series of standards

 

Divisions within SQuaRE

• ISO/IEC 2500n – Quality management division

– All common models, terms and definitions

• ISO/IEC 2501n – Quality model division

– Detailed quality model including characteristics for internal, external and quality in use

• ISO/IEC 2502n – Quality measurement division

– Quality measurement reference model, definitions of quality measures and guidance for their application

• ISO/IEC 2503n – Quality requirement division

– Guidance for specifying quality requirements

• ISO/IEC 2504n – Quality evaluation division

– Requirements, recommendations and guidelines for quality evaluation

 

SQuaRE Architecture and Related Documents 

Relationship between ISO/IEC9126 and

ISO/IEC 14598 series and SQuaRE series

SQuaRE Common Models

• SQuaRE general reference model

– Navigation guide through SQuaRE series of standards as a function of user’s task

• Software product quality life cycle

– The views of internal, external and quality in use software quality during the software life cycle

• Quality model structure

– Categorization of software quality attributes into characteristics, subcharacteristics and quality attributes

 

SQuaRE General Reference Model

 

Software Product Quality Life Cycle Model

 

Issues for the Future

• Technical Issues:

– Integrate with CASE and Management Tools.

– Develop & Validate Quality measures.

– Invite More Field Experiences.

• Standard Issues:

– Integrity within Software Engineering Standards.

– SQuaRE Architecture Extension

– Speed Up the Standardization Process.

– Develop Quality measures Registration Scheme.

 

References

 

1. ISO/IEC JTC1/SC7 web site, www.jti1-sc7.org

2. Azuma, M., 2001, “SQuaRE: The next Generation of ISO/IEC 9126 and 14598 International Standards Series on Software Product Quality,” in Proceedings of the European Software Control and Metrics Conference (ESCOM), 2-4 April 2001, London, UK, pp. 337-346

3. Eddie Burris, “Software Quality Management”, http://programminglarge.com, 2003.

4. ISO/IEC 9126-1, Software Engineering – Product quality – Part 1: Quality Model

5. ISO/IEC TR 9126-2, Software Engineering – Product quality – Part 2: External metrics

6. ISO/IEC TR 9126-3, Software Engineering – Product quality – Part 3: Internal metrics

7. ISO/IEC TR 9126-4, Software Engineering – Product quality – Part 4: Quality in use metrics

8. ISO/IEC 14598-1:1999, Information Technology – Software product evaluation – Part 1: General overview

9. ISO/IEC 14598-2:2000, Information Technology – Software product evaluation – Part 2: Planning and management

10. ISO/IEC 25001:—, Software Engineering – Software Product Quality Requirements and Evaluation (SQuaRE) – Planning and management

11. ISO/IEC 25010:—, Software Engineering – Software Product Quality Requirements and Evaluation (SQuaRE) – Quality model

12. ISO/IEC 25020:—, Software Engineering – Software Product Quality Requirements and Evaluation (SQuaRE) – Measurement reference model and guide

13. ISO/IEC 25030:—, Software Engineering – Software Product Quality Requirements and Evaluation (SQuaRE) – Quality requirements

14. ISO/IEC 25040:—, Software Engineering – Software Product Quality Requirements and Evaluation (SQuaRE) – Evaluation reference model and guide

 

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