An OT/OTA team works with adult clients who have autism. A treatment plan is developed for each client focusing on increasing self-care skills. The OTA, using toothbrushing as an intervention, evaluates the specific steps of the task, the order in which they are performed, the tools and materials needed, and the environment in which toothbrushing is performed. The OTA is then able to customize a toothbrushing routine as an intervention for each individual client. The OTA has utilized what therapeutic process to prepare for toothbrushing as an intervention?