Human becoming: Parse's Theory of nursing.

This article updates Parse's theory of human becoming (formerly man-living-health) and the congruent practice and research methodologies. The language of the assumptions and principles is revised to be in keeping with the change in name, from "man-living-health" to "human becoming." No other aspects of the theory are changed. Assumptions underpinning the Parse research method are specified for the first time. Specific examples are included to illustrate the practice methodology and references named to demonstrate the research methodologies. The practice and research methodologies are presently evolving, and it is anticipated that the evolution and use of these methodologies will enhance the theory. The ontology and the congruent methodologies are offered as a contribution to the evolution of nursing science.