Before starting software projects proper cost estimation for accurate project planning and staffing is required. The project requirements, which are normally not well defined in the early stage of a project, need to be considered carefully for a comprehensive calculation. In order to discuss and understand the project requirements, Mock-Ups or Prototypes are often used, as they provide the possibility of analyzing the potential customer's requirements. Because they show the way the software

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... s and how they get in touch with it, Mock-Ups are a suitable approach for visualizing needs. In this paper we propose a method using Mock-Ups not only to understand and discuss the project requirements but for proper cost estimation. For achieving this, we use the semantically enriched Mock-Up elements for cost estimation.