What is that!?? I have been asked to show how a differentiated lesson I have planned fits into a general theory of differentiation but all I can find is everybody's completely different, unique, conflicting, hairbrained takes on it... nothing 'general' there! As qualified teachers, do you receive guidelines/instruction on how you are expected to approach differentiation. More specifically in the secondary school maths area but all info would be very very appreciated. Thank you!!