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What is a Mid-Range Theory? Here are some excerpts from three sources: McKenna H.P. (1997). Nursing Models and Theories. London, Routledge, p. 144-146 Meleis, A. I. (1997). Theoretical Nursing: Development and Progress (3rd ed.). Philadelphia: Lippincott Criteria for mid-range theory: Whall, A. (1996). The structure of nursing knowledge: Analysis and evaluation of practice, middle-range and grand theory. In Fitzpatrick J & Whall, A, eds. Conceptual Models of Nursing: Analysis and Application. (3rd ed.) Stanford, CT: Appleton & Lange. Nolan, M. & Grant, G. (1992). Mid-range theory building and the nursing theory-practice gap: A respite care case study. Journal of Advanced Nursing, 17, 217-223. Kolcaba, K. (2001). Evolution of the mid range theory of comfort for outcomes research. Nursing Outlook, 49(2), 86-92. For another view on mid-range theory, see: Parse, R.R. (2000). Obfuscating: The persistent practice of misnaming. Nursing Science Quarterly, 13(2), 91-92. Parse asserts that "[t]o add the adjective middle-range does not fit with the term theory since it reflects a lower level of discourse" (p. 91).