As with the Power Tiles, I incorporated Challenge Cards with this activity as it worked really well before. Last time I had them focus on their collaboration as a group and today I had them focus on their group's communication. This challenged them a bit as it forced them to verbalize what they were doing and include everyone in the group. There were several students who are strong leaders, so this was good practice for them allowing everyone to actively be part of the building process. I had them turn in their evaluation cards before moving on to the next challenge so that I could have them explain how their circuit worked as well as how they worked together as a team.