Summers during college, I worked as staff at a summer camp, where part of the "camp experience" was that the kids got to (had to) help wash the dishes are meal

Summers during college, I worked as staff at a summer camp, where part of the "camp experience" was that the kids got to (had to) help wash the dishes are meals. This was usually done by a rota, so a different subset (4 to 5) of the campers (mostly 6-12th grade, but there were adult camps too) helped after each meal, and the staff took turns supervising this. As such, over the course of a few summers, I have watched 100s (18 meals/week, 10 weeks/ yr, 3 years) of discrete groups of people of varying ages "wash" dishes and can confirm that there is a wide range of dishwashing skills across the following criteria: - cleanliness (what % of dishes had to be sent back for rewashing because they were too dirty for the sterilizer) - speed (fast groups would be done in 20-25 minutes. Slow ones could take an hour+, mostly because they would spend time complaining or arguing rather than actually washing anything) - how much of a mess was made (sink water splashed on the floor, mostly) during the cleaning progress And our dishes were unbreakable, but if they hadn't been, I'm sure "breakage" would have been a metric too.