%0 Journal Article %T Automation Stages & Levels, 20 Years After %A Christopher Wickens %J Journal of Cognitive Engineering and Decision Making %D 2018 %R 10.1177/1555343417727438 %X In this article I describe the origins of the stages and levels of the automation concept and present the taxonomy, model, and theories underlying this concept. I then show how both simplifications and elaborations of the resulting tradeoff model of degree of automation can address some of Kaber¡¯s concerns about its utility in design %K automation %K level of automation %K situation awareness %U https://journals.sagepub.com/doi/full/10.1177/1555343417727438