The relationship between leader and group.
Dorwin Cartwright (1915–2008) and Alvin Zander (1913–2012) led Michigan's Research Center for Group Dynamics — Lewin's intellectual heirs — after its move from MIT in 1948. Their landmark reader consolidated the science of cohesion, norms, power, and leadership as group phenomena.
Cartwright and Zander consolidated the science of groups — cohesion, norms, power, and the leader–group relationship. Leadership became inseparable from the group in which it occurs.
The era: The Group Era — Leadership can be learned; leader–group relations. Not apart from the group but part of the group — any member can lead.
The relationship between leader and group.
This theory sits in the The Group Era era of the map: Leadership can be learned; leader–group relations. Not apart from the group but part of the group — any member can lead.
Manage cohesion and norms as directly as you manage tasks.
Diagnose the leader-group relationship, not just the leader.