What Makes a Good RFP?

A major part of my job is writing RFPs for security systems, it seems to be something of a black art. I've seen a lot of examples of bad RFPs in the articles and discussions, but can anyone tell me what exactly is in a good one? What information do vendors need to make good proposals? Are there any examples you can send me (suitably redacted of course) of good RFP? ...

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