4.3 Data flow diagrams

The following diagrams (figures 2-5) indicate the data flows in the system, showing how interaction by the user causes changes to be made in the view of the model presented on the screen.

Figure 2: Initial level view of system
initial level data flow diagram

Figure 3: First level view of system
first level data flow diagram

Figure 4: Procedure 2: rendering of the model
procedure 2 DFD

Figure 5: Procedure 2.2: Required View of Model Calculated
procedure 2.2 DFD

Data dictionary


Data stores

Data flow

  1. Activation procedure = the procedure by which the institution activated the system and produces the first view of the tomb model
  2. Choice of action = the decision to move in any direction by the user by using the mouse
  3. Choice of tool = the choice the user makes to specify which navigational tool is currently employed
  4. Model data = the digital data regarding the model required to produce one view
  5. Model information = the site and sounds of the model which are imparted to the viewer
  6. No input = the signal given when the user does not interact with the system
  7. User choices = the instructions the user gives the system via the mouse
  8. Stored information = all the digitally stored information required to render the model (including software)
  9. View of model = the data needed to produce a view of the model on the screen

External entities


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Last updated: Mon Nov 29 1999