Since the early 2000s, public policy has encouraged companies to take action in the field of work-family life balance by developing mechanisms that go beyond their legal obligations, making them a negotiating and strategic issue. This explicit call for businesses to take the initiative combines tax incentives, incentives for sharing good practices, and encouraging collective bargaining. The objective of this article is to explore the extent to which firms respond to these public incentives. It is based on a study for the CFDT (Confédération Française Démocratique du Travail) of 16 large and medium-sized multi-site companies representing a varied spectrum of activities and geographical locations. This qualitative study, which brings together the views of management with those of the CFDT representatives, provides an insight into how employers and trade union representatives take up the question of work-family life balance, the results they achieve, and the obstacles they encounter in their action in this area.