It’s a common occurrence in Corporate America: An entrepreneurial founder starts a successful business, builds it to a certain size and hands it over to a CEO to run. But then, when things don’t go well, the founder steps back in to take direct control of the organization. That, essentially, is what happened last week when Michael Dell returned to become the CEO of Dell, replacing Kevin Rollins. What will it take to turn Dell around? Wharton management professor Peter Cappelli is the director of the school’s Center for Human Resources.