1. School of Computing, Dublin Institute of Technology.
Software Quality Management Quality Assurance, Quality Control, Quality Engineering
Ronan Fitzpatrick
School of Computing, Dublin Institute of Technology.
April 2007

2. Software Quality Management
Functions of software quality
Software Quality Assurance
Software Quality Engineering
Software Quality Control

3. Software Quality Assurance
A planned and systematic pattern of all actions necessary to provide adequate confidence that the item or product conforms to established technical requirements.
(IEEE Std )
Assuring that processed are in place that will result in a quality software product
Throughout the entire life cycle.

4. Software Quality Assurance
The function of software quality that assures that the standards, processes, and procedures are appropriate for the project and are correctly implemented.
NASA

5. Software Quality Assurance
Subsists in the Quality Management Vision
Quality Manual
Standards ISO, CMM
Audits for certification and accreditation

6. Software Quality Assurance
The goal of Software Quality Assurance is to reduce the risks
Technical risks
Will not perform as intended
Will be difficult to operate and maintain
Programmatic risks
Cost overrun
Schedule delay

7. Software Quality Assurance
Advantages
Improved product quality
Reduced cost of development
Improved time to market
Improved staff productivity/satisfaction
Improved customer satisfaction
Improved perception of organisation
Improved competitive advantage.

8. Software Quality Engineering
The function of software quality that assures that quality is built into the software by performing analyses, trade studies, and investigations on the requirements, design, code and verification processes and results to assure that reliability, maintainability, and other quality factors are met.
NASA
Doing

9. Software Quality Engineering
Alternative definition

10. Software Quality Engineering
Best engineering and development practice
Measurement
Testing (Unit, integration, system and acceptance)
Focused on all quality factors
Test results
Walk-through (who was involved and what was discovered)
Acceptance (all requirements are as expected)
Software tool confirming tests were executed
Management signoff
Best Usability practice and testing

11. Software Quality Control
Activities carried out to ensure that a component of a quality factor is present in a software system and its documentation.
Pressman (1994,p560)
Specific to a particular software project

12. Software Quality Control
The function of software quality that checks that the project follows its standards, processes, and procedures, and that the project produces the required internal and external (deliverable) products.
NASA

13. Quality Control Associated with control we have: Definitions
power, authority, responsibility
Definitions
To test, to check, to verify
To direct, to command
To correct, to change
To spend
To monitor, to record, to decide

14. Quality Control
Change project
to quality
Project control uses a repeating strategy of monitoring project progress at set intervals, gathering data relating to the progress, analysing that data to ensure that the project is still on course relative to the original plan and making appropriate decisions to ensure the project stays on course.

15. Software Quality Control
Associated with
Validation
‘Building the right product’
Requirements specification
Verification
‘Building the product right’
Documented development process was followed.

16. Software Quality Control
Reminder - Control is applied to
Product
Quality factors; good enough quality
Design
Coding practice
Source code control and best practice
Code reviews
Change management
Configuration and release management
Usability

17. Software Quality Control
Staff control
Schedule control
Budget control

18. Another view
Software Quality Assurance (SQA) consists of a means of monitoring the software engineering processes and methods used to ensure quality. It does this by means of audits of the quality management system under which the software system is created. These audits are backed by one or more standards, usually ISO 9000.
It is distinct from software quality control which includes reviewing requirements documents, and software testing. SQA encompasses the entire software development process, which includes processes such as software design, coding, source code control, code reviews, change management, configuration management, and release management. Whereas software quality control is a control of products, software quality assurance is a control of processes.
Wikipedia (2008)

19. Another view
Software Quality Control (also known as Verification and Validation (software)) consists of a means of controlling the quality of software engineering products. It does this by means of tests of the software system. These tests can be unit tests, integration tests, or system tests. It also includes the formal proof of individual pieces of code, and the review of documents and code.
It is distinct from software quality assurance which includes audits of the quality management system against a standard. Whereas software quality control is a control of products, software quality assurance is a control of processes.
Wikipedia (2008)

20. Software Quality Management
Software Quality Assurance

21. Exercise
Compare with ISO 12207

22. Conclusion Functions of software quality Software Quality Assurance
Software Quality Engineering
Software Quality Control

23. Questions?