Develop a prototype that is able to estimate implementation costs from text-based user stories and de lege artis defined software requirements. The approach should be based on (1) a standard language model (SLM), and (2) a standard cost estimation model (e.g. COCOMO-II). If performed as a diploma thesis, must include an evaluation with users and/or known project data (e.g. large open-source projects). Requires good knowledge in software development and software process management.