The evolution of an intervention--the use of Peplau's process of practice-based theory development.

In 1969, at the first Nursing Theory Conference, Hildegard Peplau proposed a research methodology that would guide the development of nursing knowledge. To direct nurses in the development of practice-based theory, Peplau proposed a three-step process that would assist in this pursuit. The purpose of this paper is to describe the use of Peplau's process of practice-based theory development as it has directed a program of research in the area of depression. Peplau's ideas related to practice-based theory development came at a time in nursing when grand theories were being developed and theoretical nursing was highly valued. Peplau, ahead of her time, proposed an approach that valued the development of nursing knowledge in practice, while also combining both qualitative and quantitative methods. This research methodology deserves recognition today, as one that can guide knowledge development in psychiatric nursing.