Chidambaram and Tung found that group size mattered immensely in a group's performance. The smaller the group, the more likely each member was to participate, regardless of range (dispersed or co-located). The main difference stated between distributed and co-located groups was the social pressure at least to appear busy that is present in co-located groups. When others are present, people feel the need to look as if they are working hard, while those who are not in the presence of others do not.