In 1965, psychologist Bruce Tuckman published a paper reviewing research on small group behaviour and proposed that teams consistently move through four stages of development. He called them Forming, Storming, Norming, and Performing. Twelve years later he added a fifth — Adjourning — to account for what happens when a team's work is complete.

The model has aged well, which is not something you can say about much management theory from the 1960s. Here is what each stage actually involves and what it means for how you lead.

Forming

In the Forming stage, the team is assembled and oriented. Members are polite, cautious, and heavily reliant on the leader for direction. Nobody quite knows what is expected of whom. The work gets done — if it gets done — through compliance and goodwill rather than genuine collaboration.

The leader's job here is clarity: clear goals, clear roles, clear ways of working. People need a scaffold to work within before they can start modifying it. Jumping straight to autonomy at this stage leaves people guessing.

Storming

As people settle in and begin expressing their actual opinions, conflict emerges. This is normal and, handled well, productive. The Storming stage is where the team starts to find its real shape — where it becomes clear who works how, what people value, and where there is genuine disagreement about approach.

The temptation is to smooth over Storming as quickly as possible. This is usually a mistake. Teams that skip genuine conflict resolution tend to carry unresolved tensions into later stages, where they surface at worse moments. A better approach is to facilitate honest disagreement and help the team reach actual resolution rather than polite avoidance.

Norming

The Norming stage is where the team begins to find its rhythm. Ways of working are established, roles are understood, and members start to appreciate each other's strengths rather than chafing against each other's styles. The leader can step back — not disappear, but delegate more and direct less. Trust has started to accumulate.

This is also where the leader can start introducing more autonomy. The team has demonstrated that it can navigate disagreement and build shared understanding. That is the foundation for self-organisation.

Performing

In the Performing stage, the team operates effectively with genuine autonomy. Problems are solved at team level. Decisions are made by the people closest to the work. The leader's role shifts to removing obstacles and ensuring the team has what it needs, rather than providing direction on the work itself.

High-performing teams are characterised not by the absence of differences but by how productively those differences are used. Disagreement is expected and engaged with rather than suppressed. The team's collective intelligence is greater than the sum of its parts.

Adjourning

When a team's purpose is complete, the Adjourning stage — sometimes called Mourning — involves the dissolution of the group. For teams that have worked closely together over a significant period, this can be a genuinely emotional transition. Acknowledging that explicitly, and marking the end of the team's work intentionally, tends to produce better outcomes than simply reassigning people to new projects without closure.

What the model is useful for

Tuckman's model is most valuable as a diagnostic tool. If a team is underperforming, understanding which stage they are in gives you a better-calibrated response than generic team-building interventions. A team in Storming needs something different from a team stuck in Norming. The model helps you ask the right questions.

It is also worth remembering that teams do not always move through the stages linearly. A major change — new members, a significant setback, a shift in goals — can push a team back into an earlier stage. That is not regression. It is the model working as intended.