O'u cymharu â'r model ar gyfer ysgolion uwchradd, mae'r heriau ar gyfer datblygu model gwrthrychol ar gyfer ysgolion cynradd yn fwy o lawer. Yr her fwyaf oll yw'r ffaith bod llawer mwy o ysgolion lle mae nifer llai o ddisgyblion.
There are greater challenges in developing an objective model for primary schools compared to secondary schools. The greatest of these is the large number of schools which have a small number of pupils.