The specification of requirements is one of the most important stages in the development of information system. The correct description is one of the principle goals in preparation of specification of requirements. Well-done specification of information system is a significant support to create software with high functionality, low maintenance and adaptation costs. Filled in document forms play an important role in the analysis of user requirements. This analysis helps to reduce the gap between the user and the system analyst. The methods of form analysis are oriented in creation of an entity relationship scheme. Information system department offering user requirements specification process of functional requirements specification method is similar to natural requirements analysis proceeding. This process begins from specification of users' requirements to incoming and out coming information. This work presents the model and prototype for specification of users' requirements to incoming and out coming information. The model is based on analysis of documents forms given by user. Method is divided into three phases: 1) user incoming and out coming information, 2) data structure analysis, 3) conceptual schema generation. The meta-model repository of requirements specification is presented. The specification process and prototype of specification of incoming and out coming information of user’s requirements are described.