Similar procedures can be applied to identify the most effective ways to support the development of skills in learners with ASD. For example, a well-trained teacher often does a short preference assessment at the start of every lesson to make sure she has information that will motivate the student in that session. In addition there are multiple ways to teach children to form discriminations among items, to produce useful sounds, to engage in prosocial behaviors, and so forth. The skilled teacher knows how to make gradual and appropriate increases in instructional demands to ensure the child continues to make good gains. Professionals or settings that adhere to a single teaching strategy in all situations are likely to do well with some children or goals, but fail with others.