Graded Scratch is run over Two Series with each spanning 6 weeks with 3 swims per night.
Swimmers are assigned to a group dependant on the 50m freestyle time, so as to ensure swimmers of similar ability compete against each other.
Points are allocated depending the level of improvement from the last time that swim was attempted in Graded Scratch.
The purpose of the series is to encourage swimmers in to improve their times, thus focusing on self improvement.