This issue of ALT-J is dedicated to Professor David Squires, the previous editor of ALT-J, who died tragically in August 2001. A previous editorial of this journal paid tribute to David's work and provided a review of some of his research interests (Conole, 2001). The seven articles in this issue are from friends and colleagues who worked with David over the years. Some worked with David for only a relatively short time; others are lifelong friends. The authors represent internationally recognized experts in their field and come from all corners of the earth. This in itself is a testament to David's significant contribution to learning technology research. The authors have submitted papers which in some way align with David's own research work or report on joint work done by the authors in partnership with him.