Systems Development Life Cycle Methodology is a recommended way of doing something. Systems development life cycle (SDLC) is an application of the systems approach to the development of an information system. Traditional SDLC stages are: –Planning –Analysis –Design –Implementation –Use
System Development Tools Process modeling was first done with flowcharts. –ISO standards –Use of 20+ symbols Data flow diagrams (DFD) is a latest graphic representation of a system that uses four symbol shapes to illustrate how data flows through interconnected processes. DFDs are excellent for modeling processes at a summary level.
Data Flow Diagram Symbols Process is something than transforms input into output. Data flow consists of a group of logically related data elements that travel from one point or process to another; can diverge and converge. Data storage is a repository (warehouse) of data. Connector contains the number of the process that provides the data flow.