A group may be defined as a collection of two or more people who work with one another regularly to achieve common goals. In a group, members are mutually dependent on one another to achieve common goals, and they interact with one another regularly to pursue those goals. Effective groups help organizations accomplish important tasks. In particular, they offer the potential for synergy – the creation of a whole that is greater than the sum of its parts. When synergy occurs, groups accomplish more than the total of their members’ individual capabilities.
“Any number of people who interact with one another and are psychologically aware of one another and perceive themselves to be a group” Schien (1972) Organizational Psychology.
"A group has common needs relating to task, group and individuals and each group develops its own "group personality" (Adair 1986).