Stories
Perhaps one of the difficulties with describing or measuring "competency" in technical / knowledge workers, is that we tend to have trouble explaining what we do, or, we have trouble establishing (proving?) the value behind what we do.
One way people communicate is through stories. In fact, it may be the best way to communicate amongst humans: stories. So I've been reading about how to tell stories, and probably the best hint I've come across is this: Stories (to be compelling) must reflect change of some kind. It’s too easy to tell what happened, but not how it changed us.