Sounds very much like a certain anecdote about a pottery class where one half was graded on a single final project and the other half was graded on the quantity

Sounds very much like a certain anecdote about a pottery class where one half was graded on a single final project and the other half was graded on the quantity of pots they made. At the end of the class, the half tasked with making lots of pots also ended up making better ones because they were constantly making and practicing.