My dd's school has recently introduced Class Dojo. I know this from talking to my dd - the school hasn't informed parents in any way.
Today, I got a faux sad email from my dd's class teacher (who hates her/me - I've had to make a serious complaint about this teacher recently after they acted v unprofessionally), telling me that my dd's percentage of positive praise last week was too low. I think (??) that may have been her telling my dd needed to behave better (?), but it could be read as the teacher needs to be more positive and less critical all the time. There was no explanation.
It seems a ridiculous system - surely a child can't be 'measured' (given percentages) in any meaningful sense by a system that is entirely down to the subjective choice of a teacher to give meaningless points? I know the week they first introduced the system, my dd got negative points
- the following week, I complained about the unrelated matter and entirely coincidentally my dd came top in her class with the highest number of Dojo points. 
What is the point of Class Dojo? Is it really as ludicrous as it appears? Or can those who work with it or whose dcs' schools use it tell me how its supposed to work?