"Transformation" is a process whereby an existing, controlled (predominantly Protestant) or maintained (predominantly Catholic) school can "transform" to Grant Maintained Integrated or Controlled Integrated status (a school where Protestants and Catholics are educated together). Since 1996, this process has been promoted by the Department of Education in Northern Ireland (DENI) as the "preferred" route to integration (preferred over setting up new "integrated" schools). However, until this point there has been virtually no systematic research evidence that investigates the process in practice. This paper discusses research that "mapped" the process of "transformation" in six of the twelve transforming schools in Northern Ireland. Using both quantitative and qualitative data, the study describes how teachers in "transforming" schools feel about the process of "transformation." The study also discusses the factors that primarily influence these feelings. Finally, the paper examines at the implications of this research evidence for the way in which both teachers and principals are trained to implement the "transformation" process in schools in Northern Ireland. (Contains 4 figures and a 19-item bibliography. Appendixes contain a school aggregate profile matrix and a network diagram.) (Author/BT)