Introduction In his Partnership for 21st Century Learning Framework, Ken Kay (2010) invokes certain key skills today’s students should develop: critical thinking and problem solving, creativity and innovation, and collaboration and communication. Problem solving skills such as analysis, transfer and metacognition also figure strongly in the revised Bloom’s taxonomy (Krathwohl, 2002) and the facets of understanding outlined by Wiggins and McTighe (2005). A question arises regarding how problem solving skills can best be developed in our students. As van Gelder (2005) points out, acquiring expertise in critical thinking is difficult. He notes that practice in such skills will enhance them, but also that transfer of