
The way a company welcomes someone sets the trajectory for their whole time there. Brandon Hall Group put numbers on it: good onboarding improves retention by 82% and productivity by more than 70%, and people who go through strong onboarding are three times more likely to stay.

The four phases
Pre-boarding runs from the signed offer to day one. Welcome communication, equipment, access provisioning, the agenda for the first days, and the name of the person who will act as their buddy. Almost all of it can be done before anyone shows up, and almost nobody does it.
Orientation covers the first three days: the welcome itself, how the company works, the culture and the norms nobody writes down, and the administrative setup.
Functional integration takes the first four weeks. Training for the role, introductions to the stakeholders they will actually need, real involvement in a project, and the first goals.
Full integration runs from month two to month six: independent ownership of the work, cross-functional collaboration, and the 30-60-90 day reviews.

What the first ninety days look like
The first thirty days are for learning and absorbing. Daily check-ins with the manager, training completed, introductions made, and one first deliverable that actually ships.
Days 31 to 60 are for contributing. Check-ins move to weekly, the person takes ownership of something significant, and starts showing up in cross-functional meetings.
Days 61 to 90 are for owning and improving: leading a piece of work, a real conversation about where their career is going, and feedback on the onboarding itself, while they still remember what was confusing.

The parts that carry the weight
Five things do most of the work. Time with the manager, three to five hours a week at the start. A buddy, meaning a peer who explains the unwritten rules. Learning that is structured rather than improvised. An early win, something achievable in two to four weeks. And cultural immersion, which is the only one that cannot be scheduled.
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