What does true flexibility look like? Most organizations approach it in one of two ways: as an ad hoc work-life accommodation available upon request, or as giving people permission to get their work done on their own schedule — as long as they’re available to answer emails or put out fires 24/7. Neither approach is sustainable over the long term. The authors, who have been studying workplace flexibility for years, advocate a more balanced approach that makes employer and employee needs equal. In this article they outline the downsides of work-life accommodation and boundaryless working and discuss the tenets that organizations should follow as they develop their own flexibility programs and policies.