With so many new innovative practices around (not to mention all the 'old' tried and tested ones!) it's hard to decide what to concentrate our time and effort on in order to maximise the achievement of our learners.
If you've not come across it yet, John Hattie's research is absolutely invaluable and helps take the guess-work out of it all.
He has evaluated the results of 800 pieces of research looking at what influences achievement and ordered them depending on effectiveness.
To give you a little taste, here's a diagram from visible-learning.org ranking the influences in order.
To put it in context 0.4 is 'average'.
They also provide a glossary of terms here
If you'd like to read more there are two books available with generous previews on amazon that you can look through Visible Learning for Teachers: Maximizing Impact on Learning and the original text detailing the research Visible Learning: A Synthesis of Over 800 Meta-Analyses Relating to Achievement available.