Lecturer in Nursing Royal College of NursingInstitute, London This paper explores the history of the concept of health environment in nursing discourse. The prompt to investigating the subject followed the national research and development (R&D) initiative set up through the Royal College of Nursing and the Centre for Policy in Nursing Research. Subsequent developments in national healthcare policy, particularly in relation to primary care-based commissioning and public health highlight the timeliness of such a debate. A conceptual framework for the health environment is suggested which is dynamic and practice-oriented. It is hoped that this will appeal both to academics and practitioners in order to build a base of research and practice around the health environment within and beyond the nursing professions. KEY WORDS Health environment, Conceptual framework, Broadening the scope of nursing INTRODUCTIONThe link between human health and the environment has a long history. Harkness (1995) reminds us that it was Hippocrates, in the 5th century BC, who recommended that the study of disease should include an investigation of the external environment as well as of the body's internal composition. Nearly two thousand years later, the link between infectious host, agent and environment has become a kind of holy trinity through the development of epidemiology. Although Florence Nightingale was a pioneering epidemiologist of the 19th century (NNoodham-Smith, 1950), nurses since then have tended to consider the environment as a context for care rather than as a focus of'discrete investigation (Dickson, 1997). More recently, however, nurses' perceptions of the health environment appear to have shifted, so that not only is it a geographical area, but it is also increasingly recognised as a socio-political entity, subject to change through human inventiveness (Dickson, 1997;Hoskins and Lakey, 1997).The emergence of the health environment as a legitimate area of nursing investigation was recently highlighted by its inclusion as one of six themes in a national research and development initiative aimed at developing a set of R&D priorities for the nursing professions in the United Kingdom. It therefore seems timely to consider the meanings and concepts underpinning the term health environment. This paper describes the development of a definition and conceptual framework of the health environment, which was circulated to members of the expert groups of the priority-setting exercise, with particular reference to the R&D initiative. In the first part of the paper the background to the inclusion of the term in the priority-setting exercise is explored, before moving on, in the second part, to the development of the definition and the framework itself. Finally, the utility of the framework is considered, using a number of examples of how it might be applied to nursing