I've been digging through this massive 130 page Canadian study as part of my ongoing research for my Performance Under Fire material. An interesting point I've picked up is that they distinguish between mastery and expertise. (Their words, not mine - let's not dicker about words). Expertise is a very, very high level of proficiency that is the result of arguably years of work and practice. Mastery is a lower level of competence but it is a form of competency.
For years, Randy Harris and I have said "you can either shoot or you can't." Some folks can shooter better/faster but there seems to be a minimal threshold in there somewhere. Examples we've used of being able to shoot are spinning a Farnam Rotator or passing the old Air Marshall qual. Being able to shoot seems to equal mastery for me.
This leads me to my question for the hive mind - where are these lines? What does mastery look like and what does expertise look like with a pistol. I'm thinking there's low level mastery, high level mastery, and expertise. What tests, standards, etc. do you place in each category? (I'm talking psycho-motor skills not tactics, mindset, etc. Standards that lend themselves to quantification.)