A computer implemented method for creating a use case description corresponding to a use case diagram for a process is described. The use case diagram comprises a plurality of entities wherein each entity belongs to one of a plurality of categories and is one of at least one pair of entities linked by a relationship. The method comprises retrieving a template for each entity, from a database of mark-up language templates, the database having a template for each category of entity; adapting each retrieved template such that it has a unique identifier and such that the retrieved template for at least one of each pair of related entities comprises data defining their relationship; and, storing the adapted template in a store, the stored adapted templates representing the use case description.Methods for automatically generating a use case diagram from a use case description and for synchronising a use case diagram and description automatically are described.