The first 90 days as a manager are not about proving you deserved the promotion. They are about building judgement, often before anyone has properly trained you for the role. Gallup research shows organisations get the manager appointment wrong 82% of the time, which is why so few new managers arrive fully prepared. This guide sets out a practical 30/60/90-day approach: understanding the team and building trust first, then setting direction, then delegating and reviewing what