Document Scope

[seven-phases-max]

Document the key scoping rules.

(Creating this generic ticket just to be able to redirect here all rather specific and/or too minor scoping rules tips/questions/examples.. E.g. #21, #387, #437 etc. etc.).

[postmeback]

I believe all the 3 issues mentioned here are have served their purpose. If there is nothing else, we can close them and this one also.