Teachers have to make decisions about the procedures in their classroom, e.g., how to offer support to learners with differing prior knowledge and different learning style preferences. Teachers do this (and other things) every day. The question is how much is this competence based on research and how much is it based on subjective experience? Would instruction delivered by teachers become more efficient if it was research based? What do we know about the question whether it is worth while to teach research methods in teacher training programs?