-Mobility is not high, as a stage in the process of implementation, which discovered the errors, then would have to stop completely, and return to the first stage, to update the document again, and again from the stage.-No product prototypes from the original, does not meet the needs of the service, just sold has just developed.-The high risk and less certainty.-Not suitable for the projects of high complexity, a long-term project, project-oriented (because of constantly changing object properties from time to time).
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