The first step to solving a problem is to understand it. That’s one of the keys to getting at least some unvaccinated Americans to take action. This week, McKinsey examined vaccine hesitancy and identified some of the reasons for resistance, which, once removed, could help build a bridge to herd immunity. McKinsey experts used this same problem-defining approach to examine how to improve women’s work lives, reduce methane emissions, make organizational transformations more effective, and drive revenue in meal delivery.