How do we know whether it is being used?
Count the work it changed, not the logins: decisions made with it, cases closed through it, reports nobody rebuilds by hand. Then ask the people expected to use it, without their managers in the room.
Is this a training problem or a change-management problem?
Usually both, and neither alone. Skills and confidence are one cause; the work and the organization around it are the others. Training by role, on people’s own work, helps once the work fits and leaders reward the new way. Change management that stops at announcements does not.
Who should own adoption?
The business owner whose number it is meant to move, not IT or learning and development alone. They sponsor the change, and their teams should see them work the new way. If nobody owns it, nobody notices when it stops being used.
We haven’t launched yet. Does this apply?
Yes, and it costs less before launch. The same three causes are the readiness test: can people do their work with it, does it fit the work, and do targets and decision rights reward it? The Adoption Review works the same way on a change you are about to make.
Is retiring it a failure?
No. Retiring a system on evidence stops a running cost and tells you what people will actually use. Keeping it because it was expensive is the failure.