The qualitative study reported in this paper aims to describe the planning and assessment of psychiatric nursing in a hospital environment. The theoretical framework consists of the three types of psychiatric nursing outlined in a developmental model of nursing: confirmatory, educational and catalytic. Confirmatory psychiatric nursing is based on a hierarchical and authoritarian model. Educational psychiatric nursing is based on a professionally driven and behavioural model. Catalytic psychiatric nursing is systematic, theoretical, and research-based. Catalytic psychiatric nursing may vary, depending on the patient's needs, from confirmatory and educational to situationally determined nursing. However, it always enables patient initiatives. The purpose of this paper is to describe patient initiatives during the assessment and planning of patient care by an interdisciplinary mental health team in a psychiatric hospital environment, and the assessment and planning as described by nurses working in a hospital environment. The data, which were collected in two psychiatric hospitals by videotaping interdisciplinary teamwork situations and recording interviews of nurses afterwards, consisted of 384 pages of written text. A total of 640 sentences were identified in the text as reflecting the assessment of care by the interdisciplinary team and by the nurses working in the hospital environment. Deductive content analysis techniques were used to analyse the written data. The results showed that nursing was described by the nurses to be catalytic in 13% of the cases, while the same nurses assessed psychiatric nursing to be most commonly educational (40%) or confirmatory (47%).