Building on our study findings that CEOs who lead through influence were the most effective, we followed up by conducting interviews to learn about the development advice and training these leaders had received. We asked leaders to describe how they made the journey to becoming the highly effective leaders they were. What emerged is that a leader’s evolution generally proceeds in iterative cycles, with steps forward often followed by backsliding into old habits and then a renewed effort at change. It’s a process of trial and error, and often of fits and starts, as the daily grind of immediate demands diverts attention from one’s inner work. Those who continue to progress in the journey typically go through a three-phase cycle.

First, they are confronted with a necessity for change either because they took on a new challenge that reveals the shortfalls in their leadership or through feedback from their higher-up, colleagues, or mentor.

Most successful leaders not only are receptive to critiques of their abilities and management style but also proactively seek feedback. In fact, executive coaches Marshall Goldsmith and Howard Morgan found that was the distinguishing factor for success in a study of more than ten thousand managers’ personal development tracks: sharing your growth goals with people you then ask to provide feedback on your progress was the only factor that differentiated successful self-development approaches from unsuccessful ones. In addition to formal evaluation processes, successful leaders seek informal input from both higher-ups and direct reports.

The story speaks to how even the most talented and experienced leaders, who’ve successfullly navigated through many challenges, may overlook or misinterpret arising threats or fail to perceive them at all. That may be true even when they’ve instituted good monitoring systems, with the best data gathering and analytics, and have crackerjack strategy and operations teams supporting them. Ironically, the more success they’ve driven, the more they may be given to misreadings and slackening of vigilance.

In the past, primary emphasis was placed on financial and operations acumen— still, obviously, important— but today the vanguard of innovators in the sector increasingly appreciate a CEO’s people leadership skills for achieving the above-market returns investors expect.

Improving the performance of companies that are performing fairly well is now the predominant objective, and PE firms have learned that a CEO’s people leadership abilities are the vital complement to strength in finance and operations for this new frontier of performance improvement.