What follows is the edited text of The First Annual Ida P. Rolf Science of Rolfing Lecture, given at the Annual Meeting in August 1992. In this talk, Peter looks at some of Rolfers favorite questions like, “What is the core? “; “What is structural integration? and “What was Ida really doing? “. It seems to be an important perspective in the ongoing dialogue about our work, and I am happy to be able to make it available to the members who could not be there in person to hear it.Aline Newton