OMG, have just been googling the NCETM Maths Mastery and the first bit I read on a related blog says:
Many of our key principles are indeed tried and tested, proven strategies. We didn’t invent the idea of the using concrete apparatus alongside pictorial representations to help students understand and use abstract notation. Nor were we the first to suggest that problem-solving skills should be developed at the same time as the learning of new mathematical content – not as an often-omitted afterthought.
However, what is new is how we bring lots of this good practice together into one approach. For example, many schools follow a ‘spiral curriculum’ – flitting between topics every day or week. In both our primary and our secondary curriculum plans, we’ve used a ‘cumulative’ structure. Each half-term, we teach fewer topics in greater depth, and we build upon and revisit mathematical topics throughout the year to develop and consolidate understanding.
This means students are constantly making links between concepts, drawing on previous learning to problem solve and help them tackle new ideas. Yes good teaching is of course paramount, but the mastery approach guides this.
This is exactly how I (an old dinosaur from pre-original NC) teach in our specialist setting. It works! Not slavishly following a spiral curriculum and keeping on with topics till they really get them.
I really hope our CPD providers get training on this too as it's a totally different message to the one that has been peddled for the last 20 years