Two sessions, one written summary. If we cannot describe the problem in a page we do not understand it yet.
The approach, the team, the calendar and the number. You sign the calendar, not just the price.
Four to six weeks of shadowing. We do not take the keys until we can run it without asking.
The service, on the agreed calendar, with a monthly pack that puts exceptions first.
Quarterly, in person, with the things that went wrong at the top of the agenda.