All services must adhere to these principles:
Services are secure.
Service operations leave the system in a consistent state.
Services are thread-safe and can be accessed by concurrent clients.
Services are reliable.
Services are robust.
Services can optionally adhere to these principles:
Services are interoperable.
Services are scale-invariant.
Services are available.
Services are responsive.
Services are disciplined and do not block their clients for long.
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