Chapter 4: Requirements Engineering
Your name:
Answer all questions. 1 mark per question
1. What are user requirements and system requirements?
2. What is the distinction between functional and non-functional requirements?
3. List 3 types of non-functional requirement?
User requirements are statements in a language that is understandable to a user of what
services the system should provide and the constraints under which it operates.
System requirements are more detailed descriptions of the system services and
constraint, written for developers of the system.
Functional requirements define what the system should do. Non-functional requirements
are not directly concerned with specific system functions but specify required system
properties or place constraints on the system or its development process.
Product requirements, that specify or constrain the softwareʼs behaviour.
Organisational requirements, are general requirements derived from policies and
procedures in the customerʼs organization.
External requirements, which cover all requirements derived from factors external to the
system and its development process.
