Great idea! It'll take a lot of work to perfect the system and achieve adoption on a large scale. I can see how it then will be useful in many scenarios.

Nice. I love this!

I like the idea to specifically describe skills that are often observed together within a certain skill range! Seems very easy for a person reading to get an idea of where they are, and for a person who hears it to picture how that person plays! However, I think there is quite a large gap between 'advanced' and 'elite', and also a pretty big one between 'intermediate' and 'advanced'. I think in the interest of self-evaluation, players want to see how they move between denominations over time. Of course, there is diminishing rates of improvement as you do anything, but the gap between 'advanced' and 'elite', for most people, would probably be years. On the contrary, it seems to me that 'development' is intended to describe someone who has never played and is perhaps trying out their first day. But the jump going from that to the description of 'beginner' would typically be between 5 days of playing with a lot of reps, or maybe a couple of weeks. Either way, it seems like a very rare and quickly-exited range of skill that I don't think is worth describing with 2 categories. I think it would make more sense to me if a category was inserted between 'intermediate' and 'advanced.' That seems to me like a very interesting place of skill where a lot of people lie. Below that, there are people playing volleyball, maybe even regularly, but above that, there are the people who have regular practice sessions where they get a huge volume of repetitions. The presence of explicit practice, I think, is a gigantic marker of difference for what people are doing - in terms of their attitude, goals, and level. It is the split between the top of "casual playing" and entering into whatever you might want to call what comes next. Maybe somewhat related, but I think it would be interesting to develop an ELO system for beach volleyball. Interesting for both random matchmaking, and also for the system itself. I noticed chess players just say their elo and whoever is asking immediately feels they understand, whereas if I'm talking to someone, I find 10 minutes of describing their play does less than peppering for 3-4 touches of a ball.