Scope
The set of decisions, people and results a manager answers for, as written and accepted. Most lasting conflicts between managers come from a poorly drawn scope, not from the people.
What it changes for the executive
Evaluating a manager means first evaluating whether his position, as it is today, is being held; and that assumes the position is defined. Redefining a scope is often the third option, between keeping and separating, that the executive does not see because he reasons about the person. And when two managers clash, the conflict is settled by deciding the scope, not the people.
Example
Two managers fighting over the relationship with an important client are not in a clash of characters; they are in a clash of scope, and one written line on who decides the price and who decides the delivery ends it.
A term that is missing?
Describe the situation in a few lines; the reply is personal.