Aim: to understand how nurses and midwives manage informal complaints at ward level. Background: the provision of high quality, compassionate clinical nursing and midwifery is a global priority. Complaints management systems have been established within the National Health Service (NHS) in the United Kingdom (UK) to improve patient experience yet little is known about effective responses to informal complaints in clinical practice by nurses and midwives. Design: collaborative action research. Methods: four phases of data collection and analysis relating to primarily one NHS trust during 2011-2014 including: scoping of complaints data, interviews with five service users and six key stakeholders and eight reflective discussion groups with six...