One example of how we consider approaches to collecting survey data is in the options report that underpinned a decision to bring several surveys together into a single survey from 2016-17 onwards.
Mae un enghraifft o sut yr ydym yn ystyried dulliau o gasglu data arolwg yn yr adroddiad dewisiadau, a oedd yn sail I’r penderfyniad i ddod â sawl arolwg ynghyd i ffurfio un arolwg o 2016-17 ymlaen.