Associative—When children share materials and talk to each other, but do not coordinate play objectives or interests.Cooperative—When children organize themselves into roles with specific goals in mind (e.g., to assign the rolesof doctor, nurse, and patient and play hospital).How Much Should Children Play?Indoors and outdoors, children need large blocks of time for play. According to Christie and Wardle (1992), short play periods may require children to abandon their group dramatizations or constructive play just when they begin to get involved. When this happens a number of times, children may give up on more sophisticated forms of play and settle for less advanced forms that can be completed in short periods of time. Shorter play periods reduce both the amount and the maturity of children's play, and many important benefits of play, such aspersistence, negotiation, problem-solving, planning, and cooperation are lost. Large blocks of time (30 to 60 minutes, or longer) should be scheduled for indoor and outdoor play periods. Christie and Wardle remind teachers that extra play time does not result in children becoming bored. Instead, it prompts children to become involved in more complex, more productive play activities.