Preface: Reflections on the waves of emerging learning technologies.

There have been many waves of emerging learning technologies over the past few decades. Some of these waves are extended, some waves are connected, and other waves are repeated. The authors discuss the special journal issue from the standpoint of their personal involvement in many such waves during their careers. They also detail the evolution of this special issue and the potential audiences and stakeholders for it. In the end, they pose several questions and points to ponder in looking toward the future.