Checkpoints: Design Model

Topics

• General
• Layers

General

• The objectives of the model are clearly stated and visible.
• The model is at an appropriate level of detail given the model objectives.
• The model’s use of modeling constructs is appropriate to the problem at hand.
• The model is as simple as possible while still achieving the goals of the model.
• The model appears to be able to accommodate reasonably expected future change.
• The design is appropriate to the task at hand (neither too complex nor too advanced)
• The design appears to be understandable and maintainable
• The design appears to be implementable

Layers

• There are no more than seven (plus or minus two) layers.
• The rationale for layer definition is clearly presented and consistently applied.
• Layer boundaries are respected within the design.
• Layers are used to encapsulate conceptual boundaries between different kinds of services and provide useful abstractions which makes the design easier to understand.