Bigger interest, in my opinion, in sense of practical application represents division of groups on formal and informal. The main distinction between the mentioned groups consists in the organization of the power, in management type.
Are inherent in formal group: the clear and rational aim, certain functions founded on hierarchy structure, assuming existence of the positions, the rights and duties determined by the corresponding rules; conventional attitudes between people are caused directly by their official capacity, but not their personal qualities.
The division into groups considered by us bears in itself some element of relativity; on the one hand, the informal group can turn in formal, for example, friends found the organization; on the other hand, the group can be at the same time and formal and informal, as, for example, a school class.
Small groups are part of the direct social environment in which daily activity of the person is carried out and which substantially determines his social behavior, defines concrete motives of its activity, influences formation of his personality (15; 16; 17;
Some researchers add uniform values and standards of behavior and common interests and the purposes to these signs of group. V. A. Gavrilov (3, 2 reduces rather steady main signs of small group, its essential properties to the following: group — it, first, rather steady, social education, a certain system of social interaction; secondly, a form of social association at which his members interact personally, and, thirdly, this such social interaction between individuals in group on the basis of their for joint participation in a certain social activity in which are inherent a solidarity of purpose, interests, motives of behavior, social mental sets, system of values, a community of the consciousness organizing group action.
Characteristics of group on L.I. Novikova (3, 2 as peculiar social system are: number of elements; relation between them; hierarchy; division of labor; compatibility, coordination and complementarity of activity; processes of the organization and management.
According to L. I. Novikova (the small group is a specific human community". The concept of group which has the general subject of attention and experience, is very close to concept of a community. The last is however wider on volume and includes small group, as a special case. Use of concept "group" or "social group" in the broadest sense for designation of any concrete social community — a class, the nation, collective, unorganized group, a family etc. is lawful.
In small group the direct relations and interactions between her members, emotional contact, a pliability or resistance to group pressure, social - compatibility etc. are defining. In collective as defining those interactions and relationship of people which are mediated by the purposes, tasks and values of joint activity, that is its real public and personal and significant contents act.