An Estyn review in 2013 conducted a small-scale sample of INSET in schools and found that generally they were used well in individual schools but could benefit from being more themed and strategic.
Roedd adroddiad thematig Estyn, a gyhoeddwyd ym mis Medi 2023, yn dangos enghreifftiau o arferion effeithiol a meysydd gweithredu pwysig ar gyfer awdurdodau lleol ac ysgolion.