Lumen was started by three people who kept inheriting accounts where money was being spent against numbers nobody trusted. The agency took the unfashionable position that measurement comes first, even when it delays the media budget by a month.
That means the first deliverable is usually unglamorous: server-side tracking, a lead definition agreed in writing, and a dashboard the client can open themselves. Everything after that is easier to argue about with evidence.
Tracking before spend
No media budget until the numbers are trustworthy.
One revenue definition
Agreed in week one and used in every report.
No lock-in
Rolling monthly terms with four weeks notice either way.
Handovers that work
Access, documentation and training if you take work in house.