System Document describing what the system does [closed]

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We have a bunch of requirements documents and class diagrams, but are missing the document that brings it all together.

What is the correct term for a document that gives an overview of what a system does? Or what is the best way to present an overall picture of what is going on.

Something that starts with a high level picture of what’s going on, describes what the system provides, who it interacts with, and any dependencies, etc ?

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Back in the 2167A and MIL-498 days we called it a Software Product Specification (or SPS).

If that isn't quite what you are looking for, try surfing around Simon's MIL-498 document website and see if one looks like what you need. You (probably) don't have to follow any of them exactly, but they make good templates.

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What about a nice Domain model?

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You said it yourself: System Overview.

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Sounds like an architecture document to me. http://en.wikipedia.org/wiki/Software_architecture