Lecture Requirement engineering - Chapter 4: Requirement analysis. This chapter provides knowledge of data flow diagram, use case modelling and use case diagram. | DFD definition DFD components DFD Key definition DFD level Data flow diagram shows business processes and the data that flows between them. Data flow modeling takes a functional decomposition approach to systems analysis, breaking complex problems into progressive levels of detail. 2 type of DFD Logical process models describe processes without suggesting how they are conducted Physical models include information about how the processes are .
