Let your students track their progress on their goals. I have used this approach for even my "lower" students who are nonverbal. Choose a chart based on the pace of progress you expect for a student. For a student making slower progress, use a chart with 5% increments. Students making quicker progress might use the charts at 10% increments. Or use the blank charts and insert your own increments.
Choose or let your students choose one goal to track. Write the goal simply, in kid-friendly words. Explain very simply that each week, they will color in the column as they learn more. Don't worry if your students don't seem to understand what they are doing. I have seen over time, students are able to participate in this tracking more independently as they learn the routine. With students who are nonverbal or have difficulty understanding, I try to give the benefit of the doubt that they understand more than we realize.