Strictly speaking this isn't a blog, but if you're teaching and working with teenagers I know that you will find this piece by Geoff Petty interesting. It's an extract from a longer article on his website :
DIFFERENTIATION – WHAT and HOW?
A few decades ago the world of education was very exercised by the forerunner of differentiation which was called ‘mixed ability teaching’. Then people began to realise it was not just ability that could be “mixed’’ and that teachers had to cope with a plethora of differences: learning style, age, motivation, prior learning and experience, gender, specific learning difficulties such as dyslexia, and so on. Consequently the term ‘mixed ability’ began to be replaced by the less vivid term: ‘differentiation’. But what does differentiation mean exactly?
Differentiation is an approach to teaching that attempts to ensure that all students learn well, despite their many differences. Catch phrases...