requirements creep | very significant cost overruns in projects | - using incremental development
- carefully documenting the problem boundaries at an early stage
- estimating the time any proposed requirement will take
- . deferring major changes to subsequent releases if possible
| when changes to a system are really enhancements in disguise | process | 4.9 - Managing Changing Requirements | The tendency for the set of requirements to relentlessly increase in size during the course of development, resulting in a system that is more expensive and complex than originally intended |