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Under lying themes: cannot design a system that will satisfy every
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user's needs, so must design an extensible system.
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For example:
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Security - Trade-off between security and performance (due to the cost of authentication, encryption, etc.). Rather than providing a fixed level of security, users may choose their own trade-offs by implementing their own policies or by using existing policies via inheritance.
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Fault-Tolerance - Select the level of fault-tolerance needed, and pay for only what they use. By allowing the user to implement there own services or to inherit them from library classes, providing flexibility complemented by a menu of existing choices.
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