Abstract: The question explored in this research project is: What are inpatient registered nurses' perceptions of the factors which influence therapeutic relationship development? The literature reviewed for this project includes the history of interpersonal relationships in nursing; therapeutic relationships; what constitutes these relationships. Also discussed is literature about phenomenology as the underlying theoretical and philosophical position that informs the research method. To answer the research question a single focus group was used to gather data from a group of registered nurses practising in inpatient mental health units. Focus groups as a data collection method produce data and insights that would not be accessible without the group interaction. The key themes to emerge from the data analysis were; time, environment, knowing / self-awareness, compassion and power imbalance / empowerment. These key themes are discussed in relation to the literature and the wider context of the mental health care environment. The contribution this research makes to nursing includes a list of recommendations to nurses, nurse leaders and managers who aim to provide therapeutic mental health unit environments.