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-Poor design
-The code may be damaged because of frequent changes
-Unrealistic schedule and budget expectation
Advantage
· Can be used when requirements are not specified
· The user can experiment with the system to improve the requirements.
· gaining a positive impression from the target market
- Quicker delivery of the system
- increases the chance of having the client satisfied with the working system
- Allows refinement of an existing program and do minor improvements, rather than re-writing a whole program
disadvantage
· High-risk attempt
· Strong management is required.
· Difficult to forecast the completion date of the project
· Cost high time and money
· Requires a good project management team in terms of knowledge and skills
· Not useful for every project
· Can be used to avoid documenting the requirements of the system.
· Information can be lost through so many improvement changes
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