A project data flow diagram is a graphical representation of data flow in an information system. It depicts the types of data that the system will input and output, where the data will come from, go to, and where the data will be stored. A project data flow diagram frequently elaborates a context diagram that shows some of the system detail first illustrated by the context diagram. A data flow diagram for a project depicts how processes flow through a system. It also provides information on the inputs and outputs and the process itself. This includes data stores and the various sub-processes through which the data moves.