Abstract: Assesses the experiences of registered nurses (RNs)working in aged residential care facilities in Christchurch, in performing interRAI assessments using interRAI MOMENTUM software. Explores the positive and negative aspects of their experiences and the factors affecting performance of interRAI-based comprehensive health assessments. Identifies the aids and barriers faced by RNs in applying and using interRAI. Conducts focus-group interviews with 7 RNs. Highlights the need for a unified standard assessment system.