Backward chaining is very similar to shaping. It involves the same method of teaching a behavior, except that the behavior is taught in a reverse order. Instead of teaching the task from the beginning, you do the entire task with the exception of the very last step, which you save for him to do.
Positive reinforcement is used for attempts and success. Once he has the last step of the task mastered, you add the second-to-last step, and so on. The backward approach can be more effective in situations that seem overwhelming to your child. He may view the unmade bed as an impossible task and may do whatever it takes to avoid having to make it. If he instead sees the entire bed made and he only has to put his stuffed animals on top, the task appears far less daunting.
Once he has consistently been able to put the stuffed animals on the bed, you can add the step of pulling the spread over the pillow until he has mastered this with ease and without conflict. Pulling the spread up over the bed is added next, and so on until eventually he can make the entire bed.