When using Maker Mats, I have students work in pairs or as a group of four and then they have to select one item on the mat to build together. After they are done building, they have to show me what they made, and then I check it off on their mat before they can move on. This adds a bit of accountability with what they are building and sometimes I have to send them back with direction to add a little more (because I know they can!). They usually respond really well and come back with something even better. I have to say that I was really impressed with the claw machines that the students built - many of them built some functional claw machines and spent a lot of time adding little details to their machines. I know pictures don't do it justice, but they were pretty awesome!