How does group size affect a group's behavior?

What will be an ideal response?

The evidence indicates that smaller groups are faster at completing tasks than are larger ones and that individuals perform better in smaller groups. However, if the group is engaged in problem solving, large groups consistently get better marks than their smaller counterparts. Translating these results into specific numbers is a bit more hazardous, but we can offer some parameters. Large groups—with a dozen or more members—are good for gaining diverse input. So if the goal of the group is fact-finding, larger groups should be more effective. On the other hand, smaller groups are better at doing something productive with that input. Groups of approximately seven members, therefore, tend to be more effective for taking action. One of the most important findings about the size of a group concerns social loafing—the tendency for individuals to expend less effort when working collectively than alone. It directly challenges the assumption that the productivity of the group as a whole should at least equal the sum of the productivity of the individuals in it.