This paper describes experience in business process modeling using Domain Specific Language (DSL) in several public institutions in Latvia. Authors identified five types of business model use: (1) informal model to enhance comprehension of business processes, (2) manually or semi-automatically executable model to define business processes, (3) model to specify requirements for information system (IS), (4) executable model as component of IS and (5) model to verify correctness of business processes. Authors analyze special requirements dictated by each type of use towards DSL and its support tools. Authors demonstrate ude-cases for each model type.