Secondary groups are marked by large size and identification of the individuals through inherent values and beliefs rather than real interaction. This group consists of members who are seldom in direct contact. They are usually large and formally structured, e.g., trade unions, membership organisations such as the National Trust, etc.2) Membership Groups and Reference Groups: Membership groups are those, to which the individual truly belongs, but they are formed for some purpose and expect its members to participate actively in this group, e.g., clubs, cooperatives, workers union, etc. Reference groups are those with which an individual identifies or to which he likes to belong, e.g., friends, family, etc.3) In-Groups and Out-Groups: In-groups correspond to a group of people who hold the existing values in a society or workplace, or at most, occupy a central place in social functioning, e.g., team members, family members, etc.Out -groups are the masses which are considered as secondary or insignificant in the culture, e.g., street performers, hawkers.4) Interest and Friendship Groups: Interest group consists of people who may unite to achieve a specific objective with which they are associated.Friendship groups consist of people who have some common characteristics. People belonging to a particular region or holding a particular view point or speaking similar language are inclined to form friendship groups.5) Formal and Informal Groups: When groups are formed by the organisations themselves to achieve some particular set of goals or to complete certain tasks, these groups are called as formal groups. Departments, divisions, taskforce, project groups, quality circles, committees are some examples of formal groups.Informal groups are the groups, which are formed in response to the need for social contact. These groups are formed internally within the organisation , or spontaneously by the members themselves. They are created to meet the social requirements related to the job. Several common examples of informal groups are "tea or coffee groups" and clubs.6) Temporary and Permanent Groups: Temporary groups are formed for fulfilling definite goals. They have a very small lifespan. They cease to exist after attaining the desired objectives. Problem-solving and discussing ideas are the main roles of temporary groups. Meetings, committees are examples of such groups.Permanent groups consist of group activities, group performances, job assignments, etc. A team is a permanent group. Trade unions and commercial associations are examples of permanent groups.7) Nominal and Non-Performing Groups: Nominal groups are problem- solvinggroups . Group members exchange their ideas in a planned manner and discusstheir different options in order to select the best option. This is a nominal groupbecause employees are members of the group only for the sake of name.Non -performing groups exist only on paper. They are formed anddeveloped without performance. They have some goals, but they do not make