For a collection of people to be defined as a group, all members must interact with one another. There are two types of interaction within a group or team: Social and Task interaction.
Members exhibit social interaction from the very start point, by the formation of friends Task interaction happens when individuals start to co-operate to achieve common goals or objectives. Yet, research tends to support the view that high interaction teams need high task cohesion to be consistently successful, whereas for moderate or low interaction teams cohesion is less important to success.
In order to a group perform at its highest level, different methods and strategies need to be applied, which will improve group productivity and reduce loafing (for instance, team-building exercises, clear and meaningful roles, specific team goals, and personal sacrifice). As a subsequent effect, group/team cohesion will be improved and positive group dynamics developed.
However, to get a number of individuals to perform together so that the end product is greater than the sum of its parts, is not simple!