Ruthlessly disregarding individual differences or special circumstances.
Example:
The school's procrustean approach to education seemed to assume that all children learned in the same way and at the same rate.
Procrustes was a bandit in the Greek tale of the hero Theseus. He ambushed travelers and, after robbing them, made them lie on an iron bed. He would make sure they fit this procrustean bed by cutting off the parts that hung off the ends or stretching those that were too short. Either way, they died. Something procrustean, therefore, takes no account of individual differences but cruelly and mercilessly makes everything the same.