Mixed trials involve running more than one procedure at a time to help keep a child engaged and increase responding. Easier tasks should be mixed with more difficult ones, and preferred procedures mixed with aversive ones. Considerations for mixing trials include the materials used and novelty. Examples of mixed trial ideas provided are using the same object for multiple learning opportunities and running difficult procedures followed by out of booth reinforcement. Pacing refers to how quickly new information is presented, reinforcement delivered, and breaks given. Problems can arise if a child has too much downtime or reinforcement is not delivered immediately. Strategies like token economies can help maintain a good pace.