An interRAI system comprises a set of clinical observations and derivative applications. Clinical observations are made by an assessor, drawing on information derived from talking with and observing the person, discussions with family members and other carers, and information from health records.

Applications are calculated from these observations, and include diagnostic and risk screeners, scales, clinical suggestions for action, quality indicators and casemix tools. They benefit clinicians in their day to day work AND administrators responsible for managing resources and quality improvement. A single set of observations serves many purposes, thus making interRAI systems highly efficient.
There are now over 20 interRAI systems that support aged care, mental health and disability services across a wide variety of settings. A full list can be found at the interRAI international site.