CHAnGE is intended as a governance tool based on a One Health (OH) approach, i.e. integrating decisions on human, animal and ecosystem health across sectors and disciplines, using systems theory and participatory processes. We propose CHAnGE as a smart phone enabled tool to elicit value systems associated to the different aspects of OH relying on personal construct psychology (i.e. repertory grids). The app will visualise the values at various scales and link them to data on health outcomes provided by personal wearables, health professionals, as well as public and corporate data streams to facilitate (1) linking personal values to public health initiatives and their outcomes, and thus provide motivation for action, (2) identifying leverage for health promoting action, (3) tracking outcomes of individual and collective action over time to document their impact, (4) embedding health-related decisions in the local socio-cultural context and enhancing stewardship, and (5) amplifying the consideration of animal and ecosystem health. The concept considers three main facets of the governance cycle: (A) From a decision-making perspective, it provides supporting information on how well values are reflected in individual or collective behaviour, thus aiding agenda setting and policy design at different levels. (B) From an implementation perspective, it allows to align individual and collective behaviour (policy) with values, and inversely may reveal how values influence the interconnected system of human, animal and ecosystem health. (C) From an evaluation perspective, it provides value-focused information from behavioural data and online choices to better understand the motivations for real-world behaviour, and allows tracking of health outcomes over time.