General :: Data Model To Specify And Track Proficiency / Currency

I am looking for a data model to define and track proficiency/currency.

Example:

You earn a licence to do X. You need to renew your licence every 2 years or so. But also, to maintain currency, you need to do what the licence gives you the right to do often enough, or else you need to do a test.

Specifically, you need to do X a specified number of times N within, say, last 3 months at any one time to maintain currency. If you have lost your currency, you need to do a test/check. So at all times, you need to have N times on record within last 3 months, or a test.

In addition, to do X legally, you also need to document that you have done X at least 10 hours within, say, last 6 months, or that you have another test within those last 6 months. This is independet of the previous requirement (concerning the number of times you did X).

Both requirements must be fulfilled at all times for you to do X legally.

So, any suitable model out there? Essentially, something capable of defining and tracking currency for various ratings and license privileges of pilots would do just fine.