What is scope creeping?

Scope creep happens when the defined scope a project is increased during the development phase. It is called creepbecause it tends to happens slowly. For example: A project was defined to handle $US. Everybody agreed to the scope ($US). Then somebody tries to add handling of the Euro and then the Yen. You now have scope creep. This is similar to feature creep - where features are added during the development phase.