The Centre collaborated with the Theological College of Queen's University in Canada to offer the International Diploma in Restorative Justice in 2003, 2007 and 2011.

The International Diploma is a six-day intensive course designed for national Prison Fellowship affiliate staff and volunteers. It begins with restorative justice theory and principles, reviews processes and programs, and concludes with each student presenting a research paper.

A total of 162 students from 51 countries have taken the course.