Let's create some arbitrary boundaries namely; does not meet requirements, meets requirements, exceeds requirements.
In the illustration below I've taken the (arbitrarily selected) profession of plumbing and assumed three equally sized buckets into which professional plumbers could be slotted in.
But wouldn't all professions be similarly distributed? No - take the example below
Here we've got a safety critical role. Constant audits, training and re-examination ensures a very different distribution. I might expect the profession of pilot to be an even more rarefied example.
So what next? I'm probably least able to speak to the profession of teaching. However, it's public sector - there's more support and management for staff yet reach the standard required. There's also less emphasis (and funding) to exceed requirements.
So what's a reasonable position to take for the profession of project management? Here's my 'gut feeling' on the distribution of project managers across the capability range.
So how did we get from our nice orderly world of plumbing to the highly eccentric world of project management?