MAJOR Reasons why people join groups

a.
PROXIMITY, INTERACTION AND  INFLUENCE
One of the most common reasons why people join groups is because they work near each other.
Informal groups seem to form among those     who are in close proximity.
  When people have frequent interaction or              contact with one another, there is likelihood
that they will form a group.
Finally, if the behaviour of one individual influences that of others, they are likely to form a group.

b. Security:
Probably the strongest reason to join the group is the need for security.
By joining a group we can reduce our insecurity – we feel stronger.
New or experienced, no employee likes to stay alone.
We derive reassurance from interacting with others and being part of a group.
This often explains the appeal of unions – if management creates an environment in which employees feel insecure, they are likely to turn to unionization in order to reduce their feelings of insecurity.

c. Esteem:
An individual can increase his self-esteem through group membership.
One may gain esteem by becoming a member of a high status group.
Associating with high status people is reinforcing.

d. Power:
Membership of groups offers power to members in at least two ways.
First, there are sayings such as “United we stand, divided we fall” and “there is strength in number.”
Secondly, leadership of an informal group enables an individual to use power over group members, even if he does not enjoy a formal position of authority in the organization.

5.NEED  FOR  AFFLIATION :
in  order  to  have  a  sense  of belonging  to  certain  people.

6.To  achieve  some  common  goals.
According  to  Jennifer  and  Gareth people  interact  with  each  other  to  achieve  certain  goals  or  to  meet  certain  needs