The activity of these things is divided into eight types over four quadrants in Joseph McGrath's cir
The activity of these things is divided into eight types over four quadrants in Joseph McGrath's circumplex model, and their development is described by the "Forming Norming Storming Performing" model of Bruce Tuckman. These things dysfunction when they meet one of three "basic assumptions" proposed by Wilfred Bion. Action in these things can be ensured using the by-product theory of Mancur Olsen. Henri Tajfel developed a "minimal" paradigm for these things to explain their segregation into "in" and "out" types. Kurt Lewin founded the study of the "dynamics" of these things, in which conformity due to a desire for unanimity leads to bad decision making, their namesake "think." For 10 points, name these hopefully-cohesive collections of people who interact.