The Interpersonal Reactivity Index (IRI) is a published measurement tool for the multi-dimensional assessment of empathy. It was developed by Mark H. Davis, a professor of psychology at Eckerd College.
The paper describing IRI, published in 1983, has been cited over 10,000 times, according to Google Scholar.
IRI s a self-report comprising 28-items answered on a 5-point Likert scale ranging from "Does not describe me well" to "Describes me very well".
The four subscales are:
Example questions: