Problem
Dr. Drey wants to investigate the play patterns of children, to see if there are any differences in vegetable consumption and cooperative play. He has the parents of these preschoolers report their vegetable-eating habits and play styles at home, but he wants to examine their play patterns in a group setting, with multiple other children in their same age group. However, he does not want to accidentally influence their play patterns in any way. Out of the data collection methods which would be most beneficial for Dr. Drey? Why?