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Structured Analysis and Design Technique

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SADT

SADT

SADT

SADT

Decomposition Structure

Decomposition Structure

What is it good for ?

  • to define user needs for IT developments (which is very used in the industrial Information Systems)
  • to explain and to present an activity’s manufacturing processes, procedure

Diagrams

SADT uses two types of diagrams: activity models and data models. It uses arrows to build these diagrams. The SADT’s representation is the following:

  • A main box where the name of the process or the action is specified
  • On the left-hand side of this box, incoming arrows: inputs of the action.
  • On the upper part, the incoming arrows: data necessary for the action.
  • On the bottom of the box, incoming arrows: means used for the action.
  • On the right-hand side of the box, outgoing arrows: outputs of the action.

The semantics of arrows for activities:

  • Inputs enter from the left and represent data or consumables that are needed by the activity.
  • Outputs exit from the right and represent data or products that are produced by the activity.
  • Controls enter from the top and represent commands which influence the execution of an activity but are not consumed.
  • Mechanisms identify the means, components or tools used to accomplish the activity. Represents allocation of activities.

The semantics of arrows for data:

  • Inputs are activities that produce the data.
  • Outputs consume the data.
  • Controls influence the internal state of the data

Written by dinh

December 7, 2009 at 9:10 pm

Posted in Flowchart

Tagged with ,

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