Answer:
William Schultz
Step-by-step explanation:
William Schultz was the researcher responsible for pointing out that in small groups our greatest need is to know if we belong to the group. According to him, small groups as well as individuals are not born mature, productive and knowing which branch they belong to. By joining a small group, each person will go through different stages of understanding their interpersonal needs, while the group itself will somehow meet those needs as relationships between different people members have special characteristics. In this way, the individual is able to recognize whether he belongs to that group or not.