Principles

• Identify and encapsulate commonality and variability.
• Separate interfaces and implementations.
• Minimize the number of names per namespace.
• Extend and refine interfaces by addition.
• Use layering.
• Minimize import requirements.
• Maximize composibility.
• Isolate context.
• Use parameterization to reflect contextual variablity.
• Build policy on top of mechanism.
• Build control on top of functionality.
• Integrate documentation.
• Integrate testing.