One important problem with software development projects is to get an early and nevertheless accurate estimation of the software development costs. In the literature various methods have been developed for this purpose. The most popular examples are Boehm's COCOMO, Albrecht's function-Point method or Sneed's object-point method. The two last-named methods are based on early results of the analysis phase, whereas COCOMO is based on an a priori estimation of the software size in “lines of code”. On the other hand, modern software development environments usually employ the object management facilities of a repository to store the documents created and maintained during software development. Hence, software cost estimation methods like the object-Point method, which are based on early analysis results, can be implemented easily on top of the repository. In this paper we present such a repository based realization of software cost estimation methods.