fuzzy sets; uncertain information; process modeling; process testing; requirements testing; optimization

This paper focuses on testing of implementation of business processes defined by process owners under uncertain conditions. The paper identifies a problem in current approach of information system testing and suggests new methodics and tool for supporting which will work with vague requirements of the process owner, which are hard to formalize in the design and implementation of IS. This methodics includes testing procedures which meet the requirements of the owner, the implementation of data structures. The whole methodics is divided into four subprocesses