While fred makes a valid point with encouraging success through incentives and rewards, it purpose of teaching is to wholly get the information across so that it sticks. While this approach may be systematic in a graded environment, it is not fundamentally sound for the purpose of education. Having a class structure lenient on reward and punishment teaches students to study what is apt for examination - and as a consequence, memorization of some of the most trivial information is a result. This is particularly common in foreign language instruction, as introductory courses often set the premise of 'you need to write X in Y way such that Z can be communicated effectively'; which is not at all how comprehension of secondary of tertiary languages is achieved. You should gauge such a system if you choose to employ it. I'm not a fan of teaching language in a class setting as it were. You miss out on immersion and true conversation - which lies outside the realm of formalities and discussing activities you did over the weekend.