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Is an external interface boundaries between products within a system model that are controlled by the developer?

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What is the town that has the solar system model within it?

A scale model of the solar system is called an "orrery". There are a number of orreries of various sizes in cities around the world.     In the UK - There is one at

Difference between internal and external control?

ØInternal control•Allows motivated individuals and groups to exercise self-discipline in fulfilling job expectations.ØExternal control•Occurs through personal supervisio