Background: Physical education teachers often use the player-coach dyad in individual opposition sports so that students can obtain information on their actions and then better regulate them. This type of work also develops methodological and social skills. However, the task of observing a partner often poses problems for failing students, who…

Describes a positive method of studying children which gives insight into the differences between "privileged" and "underprivileged", and makes possible analysis of the development of a logical concept (number). Preschool children were observed as they interacted in a controlled group situation. (ED)