The major difference between the Punctuated Equilibrium Model $($PEM$)$ and the other two group development models is that the PEM suggests:

The major difference between the Punctuated Equilibrium Model $($PEM$)$ and the other two group development models is that the PEM suggests:

that groups develop logically and optimally.

that groups evolve in a less optimal way over time.

that members of the groups first focus on establishing norms.

that groups evolve systematically from less productive to more productive.