Each group should have:

• plastic chips or pieces of construction paper (10 per student)
• small container (to hold plastic chips/paper)
• small candies or other edible treats (enough for about 5 per student)
• 1 whistle or bell
• stopwatch (or clock/watch with a second hand)
• For alternate method: 
• 10 plastic chips of pieces of construction paper in each color: yellow, red, blue
• 20 index cards or larger pieces of paper