Some felt that the survey was too long for parents to answer, and that it was not open for a long enough time period to enable a sufficient number of parents to complete it.
Teimlai rhai fod yr arolwg yn rhy hir i rieni ei ateb, ac nad oedd ar agor am gyfnod digon hir i alluogi nifer digonol o rieni i'w gwblhau.