Dawson Consulting Group has researched onboarding practices for CEOs and senior executives over 20 years. They found that creating an "Assimilation Roadmap" tailored to the executive's unique leadership style and the company's culture is key. The Roadmap identifies challenges for an onboarding team to focus on, such as stakeholder misalignments and personal blind spots. Dawson then helps implement the Roadmap through reality checks, handoffs to HR, and ensuring a successful integration and long tenure for the new executive. Their research found no executives who received a customized Assimilation Roadmap left within 5 years.