When teaching a person with intellectual disability to make a sandwich when does forward chaining and backward chaining come into place?

Forward chaining and backward chaining are both teaching methods used to help individuals with intellectual disabilities learn tasks like making a sandwich. In forward chaining, the instructor teaches the first step of the task first, and once mastered, progressively adds subsequent steps, allowing the learner to build on their skills sequentially. In backward chaining, the instructor teaches the last step first, ensuring the learner experiences a sense of completion quickly, and then gradually introduces the preceding steps. The choice between the two methods depends on the learner's preferences and strengths, as well as the complexity of the task.