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Copyright © Jerzy R. Nawrocki
ISO 9126 and Non-functional Requirements
ISO 9126 and Non-functional Requirements
[email protected]/jnawrocki/require
Requirements Engineering & Project Management
Lecture 4
J.Nawrocki, ISO 9126
Introduction
Project Vision
Business Process Descr. / Operational Scenarios
Functional Requirements
Non-functional Requirements
Development, Implem. & Testing
Transition
J.Nawrocki, ISO 9126
Introduction
Project Vision
Business Process Descr. / Operational Scenarios
Functional Requirements
Non-functional Requirements
Development, Implem. & Testing
Transition
ISO 9126
J.Nawrocki, ISO 9126
Introduction
ISO 9126: Software Engineering – Product Quality
Part 1: Quality ModelPart 2: External MetricsPart 3: Internal MetricsPart 4: Quality-in-use Metrics
J.Nawrocki, ISO 9126
Agenda
• Introduction
• Quality Model
• Quality in Use
• Internal and External Quality
J.Nawrocki, ISO 9126
Quality in the lifecycle
Process quality
Internal quality
attributes
External quality
attributes
Qualityin use
attributes
Impacts Impacts Impacts
Development process
Software product Effect of using product
J.Nawrocki, ISO 9126
Quality in the lifecycle
Internal quality
External quality
Qualityin use
Indicates
Software product Effect of using product
Indicates
J.Nawrocki, ISO 9126
External and Internal Quality
Maintainability
Functionality
Reliability
Usability
Efficiency
Portability
External and Internal Quality Characteristics
J.Nawrocki, ISO 9126
Quality-in-use
Effectiveness
Productivity
Safety
Satisfaction
Quality-in-use Characteristics
J.Nawrocki, ISO 9126
Agenda
• Introduction
• Quality Model
• Quality in Use
• Internal and External Quality
J.Nawrocki, ISO 9126
Quality-in-use
Effectiveness
Productivity
Safety
Satisfaction
Quality-in-use Characteristics
J.Nawrocki, ISO 9126
Quality-in-use Metrics
Task effectiveness – What proportion of the goals of the tasks is achieved correctly?
Task completion – What proportion of the tasks is completed (number of tasks completed / total number of tasks attempted)?
Error frequency – What is the frequency of errors?
Effectiveness
J.Nawrocki, ISO 9126
Quality-in-use Metrics
Task time – How long does it take to complete a task?
Task efficiency – How efficient are the users (Task effectiveness / Task time)?
Economic productivity – How cost-effective is the user (Task effectiveness / total cost of the task)?
Productivity
J.Nawrocki, ISO 9126
Quality-in-use Metrics
User health and safety – What is the incidence of health problems among users of the product?
Economic damage – What is the incidence of economic damage?
Safety
J.Nawrocki, ISO 9126
Quality-in-use Metrics
Satisfation scale – How satisfied is the user?
Satisfation questionnaire – How satisfied is the user with specific software features?
Satisfaction
J.Nawrocki, ISO 9126
Agenda
• Introduction
• Quality Model
• Quality in Use
• Internal and External Quality
J.Nawrocki, ISO 9126
External and Internal Quality
Maintainability
Functionality
Reliability
Usability
Efficiency
Portability
External and Internal Quality Characteristics
J.Nawrocki, ISO 9126
Functionality
• Suitability
• Accuracy
• Interoperability
• Security
• Functionality compliance
J.Nawrocki, ISO 9126
Reliability
• Maturity
• Fault tolerance
• Recoverability
• Compliance
J.Nawrocki, ISO 9126
Usability
• Uderstandability
• Learnability
• Operability
• Attractiveness
• Compliance
J.Nawrocki, ISO 9126
Efficiency
• Time behaviour
• Resource utilization
• Compliance
J.Nawrocki, ISO 9126
Maintainability
• Analysability
• Changeability
• Stability
• Tastability
• Compliance
J.Nawrocki, ISO 9126
Portability
• Adaptability
• Installability
• Co-existance
• Replaceability
• Compliance
J.Nawrocki, ISO 9126
Homework
Prepare a spreadsheet that would support collection of non-functional requirements based on ISO 9126.
UsabilityUsability
Understandability H
Learnability H
Operability L
J.Nawrocki, ISO 9126
Summary
•Quality views: Quality-in-use, External & Internal quality•Quality characteristics: 4 + 6•External & Internal subcharacteristics•Quality metrics – Examples
