High-Quality Modules

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   * Does the module have a central purpose?
   * Is the module organized around a common set of data?
   * Does the module offer a cohesive set of services?
   * Are the module's services complete enough so that other modules don't
     have to meddle with its internal data?
   * Is the module independent of other modules? Is it loosely coupled?
   * Does the module hide implementation details from other modules?
   * Are the module's interfaces abstract enough so that you don't have to
     think about how its services are implemented? Can you treat it as a
     black box?
   * Have you thought about subdividing the module into component modules
     and subdivided it as much as you can?
   * If you're working in a language that doesn't fully support modules,
     have you implemented programming conventions that support them?

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