Abstract In the computer aided software engineering environments a wide range of data about the development process can be collected. Basing on these easy - collected data our aim is to upgrade a CASE tool to bid such an information on the basis of past activities to the subjects of the software development team which can be interpreted as an estimation of the development process. This information must be evaluated upon the dynamics of the system specification in progress. The dynamic of this process is influenced by the needs of the user. The needs are mostly based on his/her assumptions about the planned system. In this paper studies on the unsteadiness of requirements specification with special attention to identification and assessment of the requirements risk are presented. Results of assessment can be used for management, control and avoidance of requirements risk detected during the system analysis phase.
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