In any team formation the first thing people look for is someone to tell them what to do. This is a perfectly natural phenomenon, given that many people will want to get on with the task and many people will believe someone else knows what the task is and how it should be done.
In any unfamiliar situation or environment people can become dependent. Jon Stokes (in Obholzer and Roberts, 1994) describes what Bion observed in his experience with groups and called basic group assumptions:
a group dominated by basic assumption of dependency behaves as if its primary task is solely to provide for the satisfaction of the needs and wishes of its members. The leader is expected to look after, protect and sustain the members of the group, to make them feel good, and not to face them with the demands of the group’s real purpose.
The job of the leader, and indeed the group, is not only to establish leadership credibility and accountability but to establish its limits. This will imbue the rest of the team with sufficient power for them to accomplish their tasks. The leader can do this by modelling the taking of individual responsibility and empowering others to do the same, and by ensuring that people are oriented in the right direction and have a common understanding of team purpose and objectives.