A data flow diagram

is a graphical description of the sequence of logical aperations that acomputer performs as it executes a program

is a graphical description of the flow of documents and information between departments of areas of responsibility

is a graphical description of the source and destivation of data that shows how data flow within an onganization

is a graphical description of the rolationship among the ufaroroprosessingand output in an infonmation system