Welcome to the fourth issue of volume 3 of JUS!
We are closing volume 3 with this special issue devoted to usability with complex systems. For this special issue we have two guest editors: Barbara Mirel and Mike Albers. In addition, both Ginny Redish and Whitney Quesenbery acted as JUS’s associate editors and contributed to putting together this special issue. The background and motivation for this special issue, along with a synthesis of the articles published in this special issue, are described in the editorial written by Barbara Mirel, our co-guest editor for this issue.