Cafwyd datganiad ynghylch y dull gweithredu symlach ym mis Tachwedd 2018 ac fe'i cyhoeddwyd am y tro cyntaf ochr â'r hen fetrigau ym mis Awst 2019. Er mis Rhagfyr 2020 ni chaniateir unrhyw addasiadau sy'n golygu bod y SCP yn dangos yr union amser yr arhosodd cleifion.
The new streamlined approach was announced in November 2018 and was published for the first time alongside the old metrics in August 2019. Since December 2020 no adjustments will be allowed meaning the SCP shows the exact time patients waited.