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structure:
how is the OS organized?
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sharing:
how are resources shared across users?
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naming:
how are resources named (by users or programs)?
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security:
how is the integrity of the OS and its resources ensured?
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protection:
how is one user/program protected from another?
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performance:
how do we make it all go fast?
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reliability:
what happens if something goes wrong – hardware or software
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extensibility:
can we add new features?
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communication:
how do programs exchange information
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concurrency:
how are parallel activities created and controlled?
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scale:
what happens as demands or resources increase?
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persistence:
how do you make data last longer than program executions?
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distribution:
how do multiple computers interact with each other?
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accounting:
how do we keep track of resource usage, and charge for it?
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