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Model diagrams

This web site is about the concept of context modelling.

Context Modelling

Context modelling provides a high-level view of IT systems, encompassing:

  • People
  • Activities
  • Information
  • External dependencies

Context modelling can be used as a valuable first step in IT application design or as a tool for IT application strategic review. To learn more about its role in application design ...read more.

Principles

The principles that drive this development are:

  1. We are not designing stand alone IT applications but business activities supported by IT.

    2. Consequence: Replace requirements gathering by business activity design.

    ...read more.

  2. Modelling should be information-centric not diagram-centric. The model is the data. Diagrams simply illustrate the model.

    3. Consequences: The tool must generate all the diagrams from the data. There should be no need to put data in the model whose only purpose is to help draw the diagram.

    ...read more.

  3. All models should be testable, even the Context model.

    4. Consequences: Every model has criteria for correctness. A modelling tool should provide analysis routines to automate the model testing.

    ...read more.

  4. Technical design and logical design go hand in hand. Feasibility and cost are everybody's concern.

    5. Consequences: Every model has criteria for success. The application architecture and technical architecture cross reference the conceptual model and logical model, and vice versa.

    ...read more.
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