What no one has to say twice

The format returned. The conversation didn't.

A coach introduced a new retrospective format in week three. The team followed it carefully. By week seven, the format was still present — the cards were still filled in, the columns were still used — but the conversations had reverted. Concerns that had emerged briefly in weeks four and five were no longer named. The room had found its way back to what it was before.

Nothing explicit was decided. No one refused the format. The old norm simply reasserted itself through the new one. Coaching that changes only explicit agreements leaves the normative field untouched — and it is the normative field that actually shapes what happens in the room.

What norms are, and why they're different from rules

Rules are explicit and enforced by authority. Norms are implicit and enforced by the group on itself. Nobody directs norm enforcement: members self-correct and correct each other without any conscious instruction. The mechanism is social approval and disapproval — a constant background signal that teaches each member, through thousands of small interactions, what is acceptable here and what is not.

This is what makes norms more durable than rules. A rule changes when someone with authority says so. A norm changes only when the group's pattern of social response changes — and that requires something different from announcing a new agreement.

The BART model diagnoses the designed structure of a team: boundary, authority, role, and task. Norms are the emergent behavioural field that fills that structure. BART tells you how the room was designed. Norms tell you what actually happens inside it.

The four norm layers

Norms operate at different depths. The intervention that reaches one layer rarely reaches the next.

How norms form

Four formation pathways account for most of what a team's normative field contains. Understanding which pathway produced a norm usually points to what kind of intervention can shift it.

Making norms visible without naming them as problems

Naming a norm as a problem usually produces defensiveness. The more productive move is narration without judgment: "I notice that when someone disagrees here, the conversation tends to accelerate and move on — is that a pattern you recognise?" This keeps the norm observable rather than accusatory, and creates space for the group to decide whether it serves them.

Three diagnostic moves: narrate the observable pattern; invite the group to reflect on whether the pattern is intentional; ask what the norm is protecting. The third question is the most useful — norms that are durable are usually protecting something real, and that protection needs to be acknowledged before the norm can be shifted.

How norms shift

Norms don't change through announcement. Three mechanisms can shift them: a critical incident in which a norm is visibly violated and the group's response is different from before — which teaches everyone that the old response was not inevitable; sustained behavioural modelling by credible members, which gradually moves the social approval signal; and new early patterns when something in the team changes — a new member, a new task type, or a new phase of work that creates a window for different patterns to form.

The coach's role in each pathway is different. In critical incidents, the work is to respond visibly and differently in the moment. In behavioural modelling, the work is to identify who in the team has the credibility to model the shift. In new early patterns, the work is to seize the opening that change creates before the old norm re-imports itself.