I don't know of any specific articles, but basically a Scope of Work (also usually coupled with a Statement of Work) is a document that describes the responsibilities of each party.
A scope of work is an important document because it prevents (or at least gives billing justification) to the "While you're doing that, can you also do this?" type task.
Those kind of things fall generally under "Scope Creep;" where you are hired (and paid) to do X, but end up doing X+ This, That, and the Other Thing.
With a Scope, you can still do it, but it's an addition, and you get paid for it.
The Scope also spells out things like "The customer will give access to ...."
"The customer will provide (power, environmental conditioning, backup, facilities ... whatever)"
It's an essential part of the contract. It describes when your job is complete. It (should) remove the possibility that the customer expected you to do something that you were not expecting to do.
The statement of work is basically a list of things you will do to meet the agreed goal of the job.
A good Scope and Statement of Work will include the existing conditions (weak power, bad environment, lack of cabling) as a starting point.
Anything the customer is expected to do should be spelled out clearly, with charges or penalties if they fail to do it (or at least time extensions based on whatever delay it caused).
The Scope / Statement can be in any form, but generally takes the form of a contract ("we'll do this, this is how we'll know when we're done, then you pay us (or finish paying us)").
A Scope/Statement is good for your reputation and Bottom Line.
Good Luck
Scott
