In 2014, the EU funded a four-year European Cooperation in Science and Technology (COST) Action to address the topic of childbirth. The COST Birth Action was a cross-European network, that brought together over 120 scientists, practitioners, activists and policy makers from 34 countries to work on intrapartum care. The central aim was to advance the state of research and practice in a specific area of great clinical and social importance, intrapartum care. The Action used inter and trans-disciplinary approaches to address birth from multiple perspectives and drew on complexity theory and the concept of salutogenesis (wellbeing). This special collection presents six papers produced from the Action and gives a sense of the range and depth of the work conducted. The Collection illustrates the knowledge that can be generated when a diverse group of people come together with a similar goals and perspectives. Underpinning theory of the action The underpinning scientific framework of the Action [1] was complexity theory, applied through the lens of Sackett's multi-system complex adaptive notion of EBM. In contrast to most research in the intrapartum period, it was also designed to explore childbirth from a salutogenic (wellbeing) perspective, with a particular focus on the salutogenic concept of 'sense of coherence'. Complexity theory The promise of classical enlightenment science has been that scientific method based on the idea that A causes B, (a linear hypothesis) can be used to uncover what is true. The belief underpinning this hypothesis is through scientific progress, we will eventually know everything there is to know about the world [2]. The academic and engineering discoveries resulting from this approach led to the marvels of the industrial revolution and a huge number of social and health care improvements. However, over the last thirty years or so there has been a significant move away from reliance on simple linear calculations undertaken in disciplinary silos,