When it comes to translating a company’s strategy into results, there’s no denying the importance of first-level leaders—those who manage others who do not manage others. At BP Group, these leaders oversee operations at retail outlets, manage work crews at chemical plants or refineries, and handle operations at drilling platforms. Some supervise more than ten people; others work with few subordinates in R&D, marketing, or human resources. First-level leaders are the ones who are most responsible for a firm’s day-to-day relationships with customers and the bulk of employees. As Harvard professor Linda Hill wrote in Becoming a Manager, “…managers on the front line are critical to sustaining quality, service, innovation, and financial performance.”

A version of this article appeared in the June 2005 issue of Harvard Business Review.