AI 入職代理：制定 30-60-90 天計畫，降低早期離職率

Research on early attrition consistently identifies three causes: the new hire did not understand what was expected of them, their manager was not adequately prepared to support their ramp, and the onboarding experience did not match what was described during the interview process. These are not personality fit problems or hiring mistakes — they are process failures that are preventable with a structured onboarding programme built before the new hire starts. According to SHRM research, replacing an employee costs on average between 50% and 200% of their annual salary depending on seniority and specialism.

Pre-boarding should include a welcome email sent within 24 hours of acceptance acknowledging the decision and setting the tone, a pre-start checklist covering what the new hire needs to do, know, and prepare before they arrive, clear communication about what day one will look like so there are no logistical surprises, and introductions to key team members before the start date so the new hire walks in knowing at least some faces. The period between offer acceptance and start date is when anxiety is highest and competing offers are most dangerous.

The first week should be built around three deliberate priorities: Connection (meeting the people the new hire needs to know — the colleagues, stakeholders, and cross-functional contacts most important to their success in the first 90 days), Clarity (understanding the role, the team's current priorities, how success is measured, and what the manager expects in the first month), and an early win (completing something concrete and visible that makes the new hire feel effective by the end of week one rather than week three).

Most 30/60/90-day plans are lists of activities like complete compliance training or meet all team members. These are easy to complete without any real indication of whether the new hire is actually ramping. Outcome-based plans specify what the new hire should know, what they should be doing independently, and what they should have delivered by each milestone. By day 30, they understand the role and priorities. By day 60, they are making independent contributions. By day 90, they are operating at full productivity and have built the relationships they need long-term.

Onboarding fails when responsibility is ambiguous — when everyone assumes someone else has handled the systems access, the team introduction, or the first performance conversation. Three separate checklists with no overlap and no gaps ensure each owner knows exactly what they are accountable for, when it needs to happen, and what a completed item looks like. The HR checklist covers administrative, compliance, and systems setup. The manager checklist covers relational, strategic, and development responsibilities only the manager can fulfill. The new hire checklist covers what the new starter needs to do, access, read, and complete.