The document summarizes several models of group development:
1) Tuckman's model identifies 5 stages - forming, storming, norming, performing, and adjourning that groups progress through.
2) Cog's Ladder model outlines 5 levels of group interaction from polite to esprit.
3) Gersick's punctuated equilibrium model suggests groups with shared experiences can work cohesively without forming, storming, and norming, but may go through these stages when realizing time constraints.
4) FIRO-B measures three interpersonal needs - inclusion, control, and affection - on expressed and wanted dimensions in group settings.