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4-SOFTWARE QUALITY ENGINeryyeyeEERING.pptx
- 1. LECTURE # 4 SOFTWAREQUALITY- ASSURANCE(CE-322) Sarosh Fatima Lecturer NFC-IET Multan 04/12/2025 1 SOFTWARE QUALITY ENGINEERING
- 2. Last Lecture 04/12/2025 2 Quality QualityTypes Quality Control Quality Engineering Different views of Quality Quality Models
- 3. 04/12/2025 QUALITY SOFTWARE (ISO-9126) 3 The International standard for Software Product Evaluation: ISO-9126 released in 1991 lists six key factors that are important in the production of quality software. They are: functionality reliability usability efficiency maintainability portability
- 4.
- 5. The Six QualityCharacteristics (ISO/IEC 9126) 04/12/2025 5
- 6. The Six QualityCharacteristics (ISO/IEC 9126) 04/12/2025 6
- 7. The Six QualityCharacteristics (ISO/IEC 9126) 04/12/2025 7
- 8. Selecting and PrioritizingQuality Factors 04/12/2025 8 Select and prioritize quality factors based on the type of application using the ISO 9126 quality model. Different applications have different critical quality requirements.
- 9. Relationships between quality factors 04/12/2025 9 Thisdiagram illustrates the relationships between different software quality factors based on the ISO 9126 model.The relationships are classified into three categories:
- 10. Relationships between quality factors 04/12/2025 10 Examplesof the relationships between quality factors Integrity vs. efficiency (inverse) The control access to data or software requires additional code and processing leading to a longer runtime and additional storage requirements. Usability vs. efficiency (inverse) Improvements in the human/computer interface may significantly increase the amount of code required. Maintainability vs. flexibility (direct) Maintainable code arises from code that is well structured.This will also assist any modifications or alterations that are required.Thus a direct relationship exists between these properties.
- 11. 04/12/2025 Takeaways 11 Trade-offs exist betweensoftware quality factors. A balance is needed based on project requirements. Certain factors, like portability and efficiency, can conflict, requiring careful design decisions.
- 12. Assignment 1 04/12/2025 12 What isHewlett Packard: F.U.R.P.S
Editor's Notes
- #3 ISO----International Organization for Standardization
- #6 Functionality Suitability: Ensures the software has appropriate functions for specific tasks. Accurateness: Ensures correct and agreed-upon results. Interoperability: Ability to interact with other systems.(Applications) Compliance: Adherence to standards, laws, and regulations. Security: Protection against unauthorized access or attacks. 2. Reliability Maturity: Measures how often the software fails. Fault Tolerance: The ability to maintain performance despite faults. Recoverability: Capability to recover from failures and restore data. 3. Usability Understandability: Effort needed to comprehend the software. Learnability: Effort needed to learn how to use it. Operability: Ease of operation and control.
- #7 Efficiency Time Behavior: Measures response and processing time, as well as throughput performance. Resource Behavior: Assesses the amount of resources (e.g., memory, CPU, bandwidth) used by the software. 5. Maintainability Analyzability: Evaluates the effort required to diagnose failures or identify necessary modifications. Changeability: Assesses the effort required to modify, remove faults, or adapt software to environmental changes. Stability: Measures the risk of unexpected side effects due to modifications. Testability: Determines the effort needed to validate modified software. 6. Portability Adaptability: Evaluates how easily software can be adapted to different environments. Installability: Measures the effort required to install the software in a given environment. Conformance: Ensures compliance with portability-related standards and conventions. Replaceability: Assesses how easily software can be substituted by another in its environment.
- #8 Immature technology → Portability If technology is still evolving, software should be portable across different platforms. Real-time application → Efficiency, Reliability Real-time systems (e.g., automotive control systems) must process information quickly and be highly reliable. Embedded system → Efficiency, Reliability Embedded software (e.g., IoT devices) should optimize resource usage while ensuring reliability.