All teachers have used a verbal pat on the back to congratulate achievement but praise can also be targeted at the strategy rather than the student. It can then direct students, or at least nudge them, along the right line of enquiry. A math class in Heather Primary School in Leicestershire, England, is the backdrop to highlight this technique, but it is proven to be effective across all ages and subjects. The lesson is observed by Philippa Cordingley, director of the Centre for the Use of Research and Evidence in Education, who explains that specific praise can be time consuming but effective.