cognitive psychology. PhD 
Just noticed while pair debugging: lack of live visibility in a programming env becomes more obvious when pairing. “Hey, can you check what type X is?” Live Vis takes better advantage of two pairs of eyes
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I think the challenge is knowing what to show. Value of printf is you only see exactly the points (you think) you should care about. A full dump of program output is obviously too much. You probably want: 1) Smart defaults 2) Lightweight interactivity 3) Zoomable UI
Digital maps are a relevant case study. Older tools focused on physical/geographic accuracy. However, people's mental model of space is different. They care about landmarks, intersections, their current location. See: "Distortions in Memory for Maps", Tversky 1981pic.twitter.com/Szc3fgB1BG
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And we can use this research to make better digital maps. Maps that emphasize the cognitively-relevant features of geography help people more effectively navigate using the map. See: "Cognitive Design Principles for Automated Generation of Visualizations", Tversky et al. 2007pic.twitter.com/I6i0fuIz5o
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i love this line of work, feels so relevant here! start top-down from the napkin drawing of what happened in the program, rather than bottom-up from the literal details
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