INTRODUCTION
The study of human caring as a unique and essential characteristic of nursing practice has gradually expanded from early definitional, philosophical, and cultural research on the meanings of caring, to the explication of theoretical definitions of caring, conceptual models, proposed taxonomy of caring concepts, a great deal of creative experimentation with research methodologies, and the development of several theories of caring.
In general, one may say that knowledge of caring has grown in two ways, first by extension and, more recently, by intension. Growth by extension consists of a relatively full explanation of a small region which is then carried over into an explanation of adjoining regions. Growth by extension can be associated with the metaphors of building a model or putting together a jigsaw puzzle (Kaplan, 1964, p. 305).
In growth by intension, a partial explanation of a whole region is made more and more adequate and outlines for subsequent theory and observation are clarified. Growth by intension is associated with the metaphor of gradually illuminating a darkened room. A few persons enter the room with their individual lights and are able to slowly perceive what is in that room. As more persons enter the room, it becomes more fully illuminated, and the observed reality is clarified (Kaplan, 1964, p. 305).
Growth by extension is implicit in the early caring definitions, explications, and models. The knowledge about caring was built up piece-by-piece, in the first ten years of study, by a few nurse scholars committed to the study of human care and caring.
Today, some fifteen years later, progress in the study of the caring phenomenon is no longer piecemeal but gradual and on a larger scale, with illumination from the works that have preceded. Growth by intension is evidenced by the development of an extant bibliography, categorization of caring conceptualizations, and the further development of human care/caring theories. Although the concept of caring has not been definitively and exhaustively explored, the understanding of the broad-scale phenomena of human care and caring has become enlarged. A review of the caring literature by Smerke (1989) and an analysis of the nursing research on care and caring by Morse, Bottoroff, Leander, and Solberg (1990) now provides researchers with an interdisciplinary guide to human caring literature and a categorization of five major conceptualizations of caring: (1) a human trait, (2) a moral imperative, (3) an affect, (4) an interpersonal interaction, and (5) an intervention. There is now a body of knowledge about care and caring that can be used to further develop new knowledge through subsequent theory and research.
The Boykin and Schoenhofer work, Nursing as Caring: A Model for Transforming Practice, is an excellent example of growth by intension. Utilizing previous caring research, caring theory, and personal knowledge, the authors have put forth a theory that will not only increase the content of caring knowledge but will also change its form. A new theory adds some knowledge and it transforms what was previously known, clarifying it and giving it new meaning as well as more confirmation. The whole structure of caring knowledge changes with growth, even though it is recognizably similar to what it has been. As one reads this theory, many of the assumptions presented seem familiar, perhaps because the authors realized that caring theory could best be understood in both its historical and immediate context.
The historical context of the systematic study, explication, and theorizing about human care and caring phenomena in nursing began some twenty years ago with the early work of Madeleine Leininger. The first structural stones were laid by a group of nurse researchers who met for the first time in 1978 at a conference convened by Dr. Leininger at the University of Utah in Salt Lake City. Some sixteen enthusiastic participants underscored the need for continued in-depth thinking and for sharing scholarly ideas about the phenomena and nature of caring.