Part I：The moments of my breakthrough, Dr. Charles Reigeluth, Indiana University, The editor of Green Books and the originator of Elaboration Theory

I felt as if I was speaking to the very heart of educational technology. It was a delightful surprise to discover that the first volume of the Green Book, Instructional-Design Theories and Models, is dedicated to Dr. M. David Merrill, whom I had the pleasure of interviewing in January 2026.

Dr. Charles Morgan Reigeluth has been a leading architect of learner-centered approach and competency-based education, emphasizing a shift from time-based instruction.

It was truly an honor to speak with him. I warmly invite you to join our conversation.