The First 90 Days: What New Leaders Should and Should Not Do

The first ninety days in a leadership role are disproportionately important. The impressions formed during this period — by the team, by peers, by the organisation above — are durable and influential. They shape how the new leader's early decisions are interpreted, how much latitude they are given when things are uncertain, and how quickly people commit to following them. Getting this period right is not simply about making a good impression. It is about building the foundation from which effective leadership is possible. Getting it wrong creates obstacles that can take a year or more to overcome.

The listening phase

The most important investment of the first thirty days is listening. Not listening as a performance — not structured listening tours designed to be seen to consult — but genuine diagnostic listening oriented around understanding the organisation as it actually is rather than as it appears from the outside or from above. What are the real constraints? Where are the informal power centres? What have people tried that did not work, and why? What is the team proud of and what do they wish were different? This kind of listening requires patience that is genuinely difficult for capable people who have been brought in to make things better. The impulse to diagnose quickly and act is strong, especially when the reasons for being hired are clear and the problems visible. But the diagnosis from the outside is always incomplete. The listening phase fills the gaps that no amount of preparation or briefing can fill, and the understanding it produces is what makes early decisions sound rather than confident and wrong.

What not to do in the first 30 days

The most common mistake in the first thirty days is making significant structural or personnel changes before the listening phase is complete. A new leader who announces changes in the first two weeks is a new leader who has decided what needs to change based on incomplete information. Some of those decisions will be right. Others will be wrong in ways that damage relationships and credibility that would have taken months to build. The cost of deciding too early is disproportionately high because early decisions signal the leader's judgement, and a visible early misjudgement creates doubt that follows subsequent decisions. The second common mistake is trying to demonstrate value too quickly through visible activity rather than through actual impact. Calling many meetings, producing many documents, making many observations, and being everywhere creates the impression of energy without necessarily creating impact. The team observes the activity and reserves judgement about whether it is producing anything. A quieter, more diagnostic first month followed by well-grounded early decisions is almost always more impressive than a first month of high-visibility activity.

The 30-to-60 day shift

Between day thirty and day sixty, the balance shifts from listening to synthesis and early action. The listening phase should have produced a clear picture of the highest-priority opportunities and the most significant constraints. This is the period to share that synthesis — not as conclusions but as observations — with the key people who shaped it, to test whether the picture that has emerged is accurate and to build shared ownership of the diagnosis before acting on it. Early actions in this period should be chosen deliberately: high-impact enough to demonstrate that the listening phase produced something useful, low-enough-risk that they can be undertaken before the full picture is confirmed. Removing an obvious obstacle, resolving a longstanding ambiguity, or making a resource decision that the team has been waiting for — these are the kinds of early actions that build credibility through substance rather than performance.

Building trust with the team

Trust with a new team is built through consistency between what is said and what is done, and through the willingness to acknowledge what is not yet known. New leaders who project certainty before they have it lose credibility when the certainty proves unfounded. New leaders who are honest about what they are still learning, while demonstrating clear competence in the areas where they do have expertise, build the kind of trust that is resilient rather than conditional. The team also watches how the new leader handles difficulty. How do they respond when something goes wrong? How do they handle disagreement? Do they protect the team or blame it? These signals are often more powerful in shaping team trust than any single decision or communication. Knowing this in advance does not make it easier to behave well under pressure, but it makes the stakes of those moments legible — which is more useful than being surprised by them.

The 60-to-90 day close

The third thirty days consolidates and commits. By day ninety, the new leader should have a clear, documented view of the priorities for the next six to twelve months, a team that understands those priorities and has been part of shaping them, and early evidence of impact that justifies the confidence the organisation placed in the hire. The ninety-day mark is not a finish line — it is the point at which the foundation should be solid enough to build on. The leaders who use the first ninety days to build a sound foundation rather than to make a fast impression are consistently the ones who perform well over the long term and look back on the period as one of the most important investments of their leadership career.

For further reading on this topic, check out our guide on Case Study: Turning Chaos Into Clarity for a Founder-Led Services.