A deliberately open scope: the subject is whatever system, defect or recurring failure you need looked at. What is not open is the boundary — the system, the access and the deliverable are named in writing before attendance, so breadth of catalogue never becomes vagueness of contract.
Declared so the conversation happens before the campaign, not in the middle of it.
These drive effort, not price. Pricing is quoted after the specification call, together with the documents we will need from you.