Abstract: This paper describes the development and validation of bicultural clinical indicators that measure achievement of mental health nursing practice standards in New Zealand (ANZMCHN, 1995, Standards of practice for mental health nursing in New Zealand). A four-stage research design was utilised including focus groups, Delphi surveys, a pilot, and a national field study, with mental health nurses and consumers as participants. Results revealed a variation in the mean occurrence of the clinical indicators in consumer case notes of 18.5-89.9%. Five factors with good internal consistency, encompassing domains of mental health nursing required for best practice, were derived from analysis of the questionnaire. This study presents a research framework for developing culturally and clinically valid, reliable measures of clinical practice.