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Intro | Defining tasks functions | Lifecycle requirements | Principles good requirements | Structuring output
Principles for good requirements
The requirements specification is a document that contains all the constraints that any viable solution should satisfy. These can be categorised into requirements that
- Must be satisfied (demand)
- Should be satisfied (wish)
The wishes can also be prioritised to help evaluate solutions that satisfy different wishes.
A good requirements specification should be
- Solution independent
- Specific, objective, and quantified where possible
- Measurable and testable
- Traceable so that the source of the requirement is understood
- Accurate in their representation of the true needs
- Complete such that any solution that meets the requirements will be satisfactory
- Well structured
| Poor statements | Better statements |
|---|---|
| "The product should be easy to use" | "The product should be usable by 95% of adults aged 16-70" |
| "The maximum opening angle of the car door must be greater than 80 degrees" | "The front seats must be accessible from a wheelchair" |
The Toyota Porte uses a novel solution for enabling access to the car seats, which might have been overlooked if the specification prescribed a conventional hinged door
Intro | Defining tasks functions | Lifecycle requirements | Principles good requirements | Structuring output