(e.g. 3 he prefers to work with 5 to months), He prefers to work with a group of from 5 to7 If both are longer (e.g. 6 months) , then the group may include from 7 to 10 members. He notes that “as rule. the smaller the group. the more frequently it meets and the longer it meets. the greater the opportunity for intensity of group involvement and growth”