Thank you. Correct, the method is not claimed to be foolproof, but just a good method for many students, and it works well in large groups, often even better t

Thank you. Correct, the method is not claimed to be foolproof, but just a good method for many students, and it works well in large groups, often even better than with one student at a time, because if someone gets stuck, others have ideas to keep the discussion going.