Experience Systems

All this talk about the clocks in Continuum has gotten me thinking about XP systems I have known, and what I have thought of them. I'll do a series of (hopefully) short posts to that effect.

Off the top of my head (and with poor, improvised titles) the dominant XP paradigms are:

• Improvement by Time and Training
• Improvement by Accomplishment:
• Improvement by Attempt
• Improvement for Acting
• Improvement Guaranteed
• Improvement Hidden

and of course,

• No Improvement

Can you think of any Experience/Advancement Paradigms that I have missed?