
Requirements can also be categorised into classes along the lines of the Kano model:
- Threshold / Basic attributes
- One-dimensional attributes (Performance/Linear)
- Attractive attributes (Exciters/Delighters)
All threshold requirements must be met, one-dimensional requirements should be weighed on cost-benefit assessments while attractive attributes should be included wherever possible, but are the ones usually washed out by time and cost considerations.
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