MetaPower Design Technology

Data Flow Diagrams

Data Flow Diagrams (DFD) are graphical representations, similar to flow charts. The DFD illustrates how individual tasks are linked by information (or data) to make up the overall program or business process. It is the central design document and is further defined through the Data Dictionary and Logic Specifications documents.

Data Dictionary

The Data Dictionary defines the meaning of all the data that is presented on the Data Flow Diagram. The document includes not only the English definitions, but it also describes the detailed sub-data elements that are contained in the data flows illustrated on the DFD.

Logic Specifications

Logic Specifications are simple, structured English statements of the logic that describes the tasks depicted in the Data Flow Diagram. The Logic Specification must describe how the data that leaves each task is created from the data that enters the task. The objective of the Logic Specification is to prove that the original problem has been solved and all the data entering and leaving the design is consistent and coherent.