Circumference of your pumpkin. Measurements are checked by a pod partner. Disputes are settled by a third person who could be a peer or the teacher. All measurements are recorded accurately. All estimates are reasonable.
Correct tool is used to take the measurement.
Accurate record of measurements 4 out of 6 times. Estimates are reasonable 4 out of 6 times. All work is done neatly. 4 out of 6 times the correct tool is used. 3 out of 6 measurements are recorded accurately.