Software Architecture with Knowledge Layer of System Requirements

User requirements represent a source of important knowledge about the developed software system. This knowledge is highly significant not only during system development, but in the phases of its operation and maintenance too. Current article describes the most common types of requirement representation and different types of knowledge representation, which ones are related to these requirements, relations between them and a comparison of these knowledge representation techniques. Formal knowledge representation integrated into a knowledge layer of the system allows their effective automated processing by computational processes during the use of the system too. Integration of this knowledge in the system architecture as appropriate models allows improving the process of implementation of new requirements into the system during its use.