THE ACTIONS YOU TAKE during your first three months in a new role will largely determine whether you succeed or fail, says Michael Watkins author of the First 90 Days ( https://www.michaeldwatkins.com/book-90days.php ). The 90-100-day performance phenomenon is a limiting paradox. You are new into the role, it may even be a new role without precedent, and many accept it takes six months to two years to learn a job properly (and, as Gladwell points out, 10 years to attain mastery). If you fail to build momentum, permission and credibility during this phase, you will face an uphill battle from that point forward. There was a compelling reason to act now, and so you are expected to respond with the same degree of urgency, although the direction may seem unclear.