This work is based on eight papers published between 1998 and 2006. The papers present a process of investigating, discussing and documenting how, through exploring, stretching and developing opportunities offered by various qualitative research approaches, facilitated collaborative action research (CAR) and evaluation became entwined They question how and where participants in projects recognise their own knowledge and learning, and how they use and develop their understandings in relation to new knowledge. In these papers I worked at the interface between the known and the nearly known; between knowledge-in-use and tacit knowledge that was yet to be useful. This interface, a 'messy area', was a place of contested knowledge. In this 'messy area' long-held views, shaped by pro essional knowledge, practical judgement, experience and intuition, came together to disturb both individual and communally held notions of knowledge for practice. Working in the 'messy area' enabled new knowing that has both theoretical and practical significance to arise, a 'messy turn' to take place. This is the purpose of mess. These papers add to the body of knowledge about 'seeing' and 'knowing', 'the importance of not knowing' and the role of participation, collaboration, facilitation and learning as key change mechanisms in research and evaluation.