Each group needs:

• LEGO MINDSTORMS EV3 robot, such as EV3 Core Set (5003400) at https://education.lego.com/en-us/products/lego-mindstorms-education-ev3-core-set/5003400#lego-mindstorms-education-ev3
• LEGO MINDSTORMS Education EV3 Software 1.2.1, free online, you have to register a LEGO account first; at https://www.lego.com/en-us/mindstorms/downloads/download-software
• computer, loaded with EV3 1.2.1 software
• marker
• meter stick
• caliper, to make circumference measurements (recommended, but if not available, use a ruler to measure the diameter of each wheel or use a string and wrap it around the wheel to measure the circumference)
• piece of paper (8.5 x 11 inch)
• rubber band
• Accuracy Pre-Evaluation, Accuracy Worksheet, Accuracy Post-Evaluation, one each per student

Note: This activity can also be conducted with the older (and no longer sold) LEGO MINDSTORMS NXT set instead of EV3; see below for those supplies:

• LEGO MINDSTORMS NXT robot, such as the NXT Base Set 
• computer, loaded with NXT 2.1 software