Articulating the ineffable. Programming language theory 
cognitive psychology. PhD @Stanford
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Pennington paper is creative experimental work on using chunks to identify whether programmers mentally represent programs as data-flow, control-flow, etc. Letovsky paper uses careful analysis of protocols w/ experts to characterize bottom-up vs. top-down reasoning & schemata.
Anderson et al. builds a production system to mirror protocols of novices learning Lisp. Early cognitive tutor work. Useful to think about how to model complex mental processes like reasoning by analogy.
