Dylai penaethiaid ystyried amgylchiadau unigol fesul achos. Bydd amryw o agweddau yn cael eu hystyried, gan gynnwys: pa adeg o'r flwyddyn y gofynnir am wyliau; am ba gyfnod y gofynnir am wyliau ac at ba ddiben; yr effaith a gaiff cymryd gwyliau ar barhad y dysgu, ar amseru arholiadau neu brofion; amgylchiadau'r teulu a dymuniadau'r rhieni; yn ogystal â phresenoldeb cyffredinol a chyflawniad y disgybl.
A head teacher should consider individual circumstances on a case-by-case basis. A number of aspects will be taken into account, including the time of year, length and purpose of the holiday, impact on continuity of learning, timing of exams or tests, circumstances of the family and the wishes of parents, as well as the overall attendance and attainment of the child.