In spite of a long list of risks to watch for, Evolutionary Prototyping is a relatively low-risk practice. Of published case studies, 33 of the 39 have reported success (Gordon and Bieman 1995). Here are some risks to keep in mind.
For related risks, see Managing the Risks of Throwaway Prototyping, Managing the Risks of Throwaway Prototyping, and Managing the Risks of User-Interface Prototyping, Managing the Risks of User-Interface Prototyping.
Unrealistic schedule and budget expectations. Evolutionary Prototyping may create unfulfillable expectations about the overall development schedule. ...