In a very few cases, cluster primary schools work together with their secondary school to agree what is taught at Key Stage 2 and 3.
Mewn ychydig iawn o achosion, mae ysgolion cynradd clwstwr yn cydweithio â’i gilydd a’u hysgol uwchradd i gytuno ar yr hyn sy’n cael ei addysgu yng nghyfnod allweddol 2 a 3.