Vector was hired because the company wanted to rely on methodological expertise and a profound change management – on the first attempt. As the main reason for project difficulties we identified requirements engineering, in particular the unsystematic elicitation and development of requirements and the too many uncoordinated changes. Only half of the agreed requirements were delivered with the finished product release. With the client we defined a suitable requirements elicitation process (such as workshops, interviews, etc.) to specify requirements in a standardized notation. It allowed a systematic assessment and analysis of requirements on impact and effort to test and validate the requirements in order to allocate the right requirements to be realized in the project. We also set up a consistent requirements management (RM) process for traceability, change control and measuring progress. After a pilot phase in which the techniques were assessed and optimized for different project types a suitable RM tool was identified, selected and piloted, because it was clear: Good processes are essential for good results, but only the right tool will foster efficiency, and that is what engineers need to accept such change.