AbstractIn this paper I reflect upon soft-systems inquiry. To do this I revisit Churchman’s discourse on the philosophical ideas underpinning inquiring systems and then discuss the practical application of soft inquiry pioneered by Checkland. This body of work suggested ontological models of organisational behavior were inappropriate and only by adopting an epistemological perspective would provide the basis for understanding complex systems that characterise human society. These ideas motivated a new way of addressing complexity. This work created a difficulty for action research since to be faithful to this discovery meant that any method of inquiry should be one that could cope with such complexity. One outcome was Soft Systems Methodology (SSM). Paradoxically the success of SSM has restrained further discussion of these ideas. The purpose of this paper is to revisit the ideas of Churchman and Checkland as a means of returning to first principles. In this paper I reassess their ideas and those of Husserl and Gadamer and suggest there is more to be gained from this rich seam of systems thinking.