Physical Data Flow Diagram


  • An implementation dependent view of the current system, showing what task are carried out and how they are performed.
  • Physical characteristics include
-      Names of people
-      Forms and document Name
-      Names of department
-      Master and transaction files
-      Equipments and devices used
-      Locations
  • Most comprehensive and useful approach to developing an accurate and complete description of current system begins with the development of a physical DFD.
  • The use of physical DFD is desirable for 3 reasons
    • Firstly it is easier to describe the interaction between physical components then it is to understand the policies that are used to manage the applications.
    • Secondly physical DFD are useful for communication with users. User’s relate easily to people , locations, and documents since they work with each entity daily. User’s can easily point out when a step is incorrect or missing.
    • Third they provide a way to validate or verify the users current view of the system. With the way it is actually operating if there are differences they will be noted and discussed.

Comments

Popular posts from this blog

Food Ordering System

Rules for Stopping the Decomposition Process in DFD