Currently, "XP" is based on a 90-day rolling score (see below KB article on How Points Get Tabulated) which causes confusion among clients who have gamification enabled. It's demoralizing to be on the top one quarter and through no fault of your own, be on the bottom because you were the first to complete training. And worse, it's without explanation.

My suggestion would be to track both 90-day rolling and lifetime scores and have an option to display one or both for gamification purposes, understanding lifetime scores would disadvantage new hires.