ProcessFlow Not Triggering

I've been asked several times recently why ProcessFlow isn't triggering so wanted to give some ProcessFlow 101 things to check:

Does the application form WF01 have the LOGAN value in the Collarborative Commerce Productline field? If not, ProcessFlow won't trigger.

Have you enabled all three of the ProcessFlow Administration Service forms?
Service Definition - Service Criteria Level Definition - Service Process Definition.
If not, ProcessFlow won't trigger.

Have you set up the application prerequisites for your approvals?
PA50 Personnel Action - Use Workflow = Y
RQ04 Requester - Requisition Approval Type - Header using Process Flow
AP00.4 Company - Workflow = Y (and so forth)
If not, ProcessFlow won't trigger.

My favorite recent issue - along with the ProcessFlow Solution Packs being installed, was the WFDATA installation also done?
If not, ProcessFlow won't trigger.