When designing a process that needs an approval scheme, look for the number of times attention is required — you may not have to break down and classify all possible requests.
If an approver has to check once a week a report that includes 30 requests and can pick out any that seems strange, the volume of requests is not 30, it’s 1.
The natural tendency is that you’ll try to create filters so that only major items are escalated. But it’s possible that you’re wasting more aggregate time than a simple straight to the top process would take.
This insight isn’t mine. I was defining an unnecessarily complex process for work and went for a sanity check with my boss. Glad I did.