6. As the mind can absorb only as much as the seat can endure and the attention span encompass, vary teaching procedures. Don't lead them to water; make them thirsty. Use repetition, drill, and review for habit formation. However, avoid grinding away at grammar or teaching them what they already know. Test before teaching. (Do not use class time to teach a handful what the rest of the class has mastered. Instead, assign make-up work for the bewildered. Use programmed materials or coach them individually during conferences.)