As a guide dog gets more experience with its handler, it may be able to take on even more responsibility. (animals.howstuffworks.com)
The star gates were there to stop people progressing too quickly, but in hindsight they just stopped players getting more experience in the game. (darkainarts.com)
As your agents get more experience under their belts, you can train them to be better at various tasks. (goodshepherd.games)