The first three papers in this issue are based on a symposium entitled “Rasmussen Revisited 3—Human Factors, Accidents and Error” held at a joint conference in Banff in 2017, organised by the Association of Canadian Ergonomists and by the Organizational Design and Management (ODAM) committee of the International Ergonomics Association. In the words of Patrick Waterson, Jean-Christophe Le Coze and Henning Boje Andersen (1): “The work of Jens Rasmussen over the course of the last half century represents some of the most influential contributions to the fields of cognitive science, human factors, ergonomics and safety science.” These three papers both honour that contribution and show the continued value of applying the theory and tools developed by Jens Rasmussen.