Abstract: This thesis describes an exploratory study of registered nurses within a local district health board which pursued 'if' and 'how' professional practice frameworks assisted nurses in their individual professional practice. Self assessment and performance appraisal are identified as critical elements of professional development by the Nursing Council of New Zealand, and this became the focus of the author's research. A qualitative descriptive framework was utilised to explore the research question, where experiences of registered nurses employed within inpatient adult medical and surgical settings were collected through questionnaire. Analysis of the data was through general inductive thematic approach. Eight themes arose, of which, two have sub-themes. The first four themes relate to self assessment and performance appraisal and the second four themes relate to professional practice. The findings from the participant's perspective provide an understanding of how participants' utilised self assessment and performance appraisal to inform their professional practice. There are significant implications for professional practice within the findings of this study, which are presented along with recommendations for future practice, and future avenues for research.