Based on a yearly performance appraisals, a promotion board made up of senior peers and subject matter experts judge assessments based on criteria set by whomever is currently sat on the board. Not the best promotion process when compared to its sister forces such as the Army or Navy, focus seems to be heavily reliant on shaking a charity bucket in works time than it does knowing the job you wish to advance in.
If you are willing to do work outside of work and give up all free time you can get promoted
skills based and experience you will then be tested to see if you can complete the promotion course.
Unless you’re liked or part of group then you’ve got no chance - no matter how good you are at your job.
Efficient and well defined
Promotion is extremely competitive with it being even more so depending on specific trade or branch
Depending on your trade it can be a long and drawn out process. You will be competing against everyone else at your rank for promotion to the next rank up. This could be 200 eligible personnel with only 5 promotion slots. I would say the average promotion length to be between 6 to 8yrs
Slow, biased and unfair
depends on your abilities