People are the most important — and most expensive — business asset. To get the most out of your investment in people, whether it's a full-time employee, consultant, advisor or fractional executive, maximizing the benefits of the relationship is crucial. And when it comes to fractional executives, the stakes are even higher because their expertise is time-limited. These highly skilled professionals offer specialized knowledge on a short- or long-term basis. Here's tips for maximizing your ROI.