Great read here!
Using games for assessment is about more than tracking points. The past five years have seen a lot of growth in the digital games and assessment field, developing data collection engines that use sophisticated tools to measure student learning and provide teachers with targeted feedback (seeGlassLab, for example).
But one of the most common misconceptions we have run across is that all good learning games must assess learners within the game. The truth is that assessment happens around a game more often than it happens inside the game, and teachers must still design and provide authentic, useful assessment tasks for students.
For the rest, read it at Edutopia!