This article categorizes definitions of work life balance (WLB) according to a framework of ethical ideologies. By understanding what perspective the definition of WLB is framed within, practitioners and academics will be better able to assess the suitability of that definition for a particular application. Although many current definitions are absolutist in nature, dictating a "right" balance that all should aspire to, the author argues that definitions reflecting a situationalist perspective are most valuable to academics and practitioners. Definitions from a situationalist perspective offer an opportunity to explore what factors contribute to attainment of WLB for particular groups of people. Once there are broadly agreed definitions of WLB for groups of people, relevant measures of WLB and WLB initiatives that respond to these definitions can be developed. This will provide a baseline for the comparative analysis of WLB programs. Implications for organization development interventions and change management practice are explored.