I did not teach this unit. I like the similarities between this lesson and some of the lessons in Unit 1. It creates a great opportunity to reflect on past lessons. I would teach the lesson the way it is outlined. I really like the handout and robot check list. I like having concrete examples. I would show the video clip from I-Robot that shows the robot showing emotion. As an extension activity, the students could build a virtual robot (found in the alternative lessons).