The First 90 Days as a New Manager: What to Learn and When to Act

The first 90 days as a new manager are an opportunity to understand your team, set clear expectations and establish how you will work together. A useful approach is to spend the first month learning, the second identifying priorities and the third putting agreed changes into practice. These are guides, not deadlines: urgent issues need attention immediately, and some decisions cannot wait until a particular date.

The shift into management also changes how your contribution is measured. Your expertise still matters, but your results increasingly depend on the clarity, support and accountability you provide to others. That takes deliberate changes in how you spend your time, make decisions and communicate.

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Days 1 to 30: Understand the team and its work

The objective of the first month is understanding, not improvement. You are building an accurate picture of the work, the people and the constraints before you have any basis for changing them.

What to do. Hold a structured one-to-one with every direct report in the first two weeks. Ask what they are working on, what is getting in their way, what they think should change, and what they want from you. Ask the same questions in the same order to each person, because the pattern across the answers is more informative than any individual response.

Also establish. How the team’s work is actually measured, as distinct from how it is officially measured. Who the team depends on outside itself. What was tried before that failed, and why people believe it failed. Your own manager’s definition of success for you at six months.

What not to do. Announce changes. Compare the team unfavourably with your previous one. Promise anything you have not verified you can deliver. Reorganise anything.

The one exception to inaction is a live safety, legal or ethical problem, which is addressed immediately regardless of tenure.

By the end of the first month, you should be able to explain:

• What the team is responsible for and how success is measured
• Where work slows down or accountability is unclear
• Which concerns are shared across the team
• What your manager expects you to achieve
• Which issues need prompt action

Days 31 to 60: Set expectations and choose priorities

The second month converts what you learned into a small number of decisions. The discipline here is restraint — identifying the two or three changes that matter most and declining the rest for now.

What to do. Form a view on the team’s three biggest constraints. Test that view with your manager and with one or two trusted people inside the team. Decide what you will change, what you will explicitly leave alone, and what you will revisit later.

Set expectations explicitly. Most teams do not know what their new manager expects and are guessing. State how you want to be kept informed, what you want escalated, what decisions people can make without you, and what standard you consider acceptable. This single conversation resolves a surprising amount of early friction.

The common error. Attempting to fix everything identified in month one. A new manager announcing six changes simultaneously is signalling that they have not prioritised, and the team will wait to see which ones are real.

Days 61 to 90: Deliver improvements and establish your routine

The third month is where you deliver something visible and establish the way you operate as a permanent pattern rather than an introduction.

What to do. Implement the changes you decided on, and complete at least one of them. A finished small improvement builds more credibility than three ambitious ones in progress. Explain the reasoning behind each change — teams comply with instructions and commit to reasons.

Establish the operating rhythm. Regular one-to-ones that actually happen, a team meeting with a consistent purpose, and a visible approach to feedback. Predictability is a substantial part of what people mean when they say a manager is good.

Give the first real feedback. Both directions. By day 90 every direct report should have received specific feedback on something they did, positive or corrective. Managers who delay this into a formal review cycle find the conversation much harder when it finally arrives.

Managing people who were your peers

This is the hardest version of the transition, and it is common, because organisations frequently promote from within a team. The relationship has genuinely changed and pretending otherwise makes it worse.

Address it directly and early. A short conversation acknowledging that the relationship has changed, that you value what it was, and that you will now sometimes have to make decisions they disagree with, is more effective than allowing the awkwardness to be discovered gradually. Then behave consistently: applying different standards to a former close colleague is the fastest way to lose the rest of the team.

Expect one specific test in the first few months — a moment where a former peer pushes a boundary to establish whether the new authority is real. How that is handled sets the pattern.

Five mistakes that derail new managers

• Continuing to do the work. The most common failure. Doing the technical work is comfortable and visibly productive, and it is no longer the job. If the team is blocked because you are the bottleneck on your own former tasks, you have not transitioned.
• Avoiding the first difficult conversation. Performance problems inherited from a predecessor do not resolve on their own, and the team is watching to see whether the new manager will address what the old one avoided.
• Trying to remain everyone’s friend. Popularity is not the objective and pursuing it produces inconsistency, which is the thing teams actually resent.
• Over-delegating too early. Handing significant work to people whose capability you have not yet assessed is not empowerment; it is abdication with extra steps.
• Under-communicating decisions. New managers often decide something and forget that the reasoning existed only in their own head. State the reasoning every time.

What to do in your first week

If the ninety-day frame feels abstract, five concrete actions for week one:

• Schedule one-to-ones with every direct report
• Ask your own manager what success looks like at six months, and write down the answer
• Find out how the team’s work is measured and by whom
• Identify the one thing everyone complains about — it is usually real
• Change nothing

Developing your management skills

New managers are often expected to delegate, give feedback and manage performance before they have had much opportunity to practise those responsibilities. GLOMACS’ The First Time Manager training course addresses the core skills involved in moving from individual contribution to team management. Managers who already lead a team and want to strengthen their approach can explore Mastering People Management & Team Leadership course.