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Software Quality Engineering

What is software quality?

the process to guarantee that a software product does the right things, but also to guarantee that the product does things right.

Software quality management

Quality Planning

  • Software Quality Assurance Plan

    • It is created before any quality assurance activities are carried out.

  • Quality Assurance

  • QA measures

    • Defect prevention

      • Education and training.

        • Product and domain specific level

        • Software development expertise

        • Knowledge about methodology, technology and tools

        • Development process knowledge

    • Defect reduction

    • Defect containment

  • How to handle defects

    • logging and tracking

  • Quality Control

    • Software Quality Requirement

    • Functional requirements

    • Non functional requirements

      • reliability, security, performance, usability, availability

  • Standards for Software Quality

    • The IEEE 730-2002 Standard

      • Software Quality Assurance Plan

        • Management
        • Organization
        • Tasks
        • Roles
        • Estimated Resources
        • Documentation

      • Software Requirement Specification

      • Software Design Description

      • Verification and validation plans

      • Verification and validation results report.

      • User documentation

      • Software configuration management plan.

      • Reviews

    • ISO/IEC 25010:2011 Standard

When compared with IEEE 730-2002, this standard provides two models of software quality instead of the structure of a Software Quality Plan. The first model contains the aspects related to quality when referring to the use of an application

Verification and Validation

What is verifiaction

  • Static
  • Dynamic
  • Software inspections

Software testing

what is validation

Typical validation activities

Typical verification activities

Verification and validation planning

Software inspections

Automated static analysis

Quality Cost Categories

  • P-CMM levels

  • Quality Assurance (QA)

    • Quality Assurance (QA) is fault prevention through process design and auditing

    • A quality audit is a structured review of specific quality management activities that help identify lessons learned that could improve performance on current or future projects.

Examples: Templates, checklists, guides

  • Quality Control (QC)

    • fault/failure detection through static and/or dynamic testing of artifacts . Examples: Code testing, peer reviews, beta trials

    • Acceptance decisions

    • Rework

    • Process adjustments

    • tools and techniques

    • Pareto analysis:

      • Statistical sampling
      • Six Sigma
      • Quality control charts

Software test plan

  • Test Process

  • Test Scope

  • Test Schedule and Resources

  • Roles and Responsibilities

  • testing process

    • Component testing

      • Software developer

    • Integration testing

      • independent testing team( Main difficulty is localising errors, Incremental integration testing reduces this problem

    • Top-down testing

    • Bottom-up testing

    • blackbox testing

  • equiv. partitions

  • structural testing/whitebox testing

    • Path testing

      • Independent path

      • Problems when using FSMs?

      • Problems with FSM states

      • Problems with FSM transitions

      • Steps to create a FSM

      • Applications of FSM

  • Power of Markov Chains