Project management is a knowledge-centric and experience-driven activity supported by the project management information system. In order to use the project management information system efficiently, it is necessary to configure it according to project requirements. The project manager is not always aware of the most appropriate configuration for the particular project. Adequate knowledge would help the project manager define the configuration requirements. Knowledge in the project management area is divided into two forms: data and processes. To generate suggestions concerning data, grouping, statistical analysis and ordering of data items as well as analysis of semantic ambiguities are used. But concerning knowledge about the processes, differences between various process representations should be studied as well as evaluation of process similarity is required. The objective of the paper is to elaborate an approach to evaluate the project management process similarity and reuse of the project-specific knowledge when defining the configuration requirements.