Courses I have built to learn a topic properly. Some track your progress as you work through them; sign in on a course to carry that progress between devices.
Alongside the chess courses there is a chess glossary: the vocabulary they use, with the words you have to see marked as such, so they are not mistaken for words you can simply look up.
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Instrument Log
Classical Psychometrics for Eval Rubrics: test theory, the kappa family, ICC and generalizability theory — measurement thinking applied to eval rubrics.
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Probabilistic Record Linkage
Deciding when two records describe the same thing, built on Fellegi & Sunter (JASA, 1969).
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Context Graphs
How context graphs connect people to the priorities that matter. A crash course in systems and data modeling.
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Teeline Shorthand to 100
Six weeks to take a passage in Teeline and transcribe it accurately twenty- four hours later.
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Copying Morse
Learn to copy an unfamiliar plain-text transmission in Morse code onto paper.
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Sending Morse
Advance to sending messages with Morse code via sound or light.
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Graphical Perception
Which visual encodings a reader actually decodes accurately, from Cleveland & McGill (JASA, 1984) to a chart you can defend with measurements you took yourself.
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Color Science
OKLCH, display gamut, and why the 4.5:1 your linter enforces is a model rather than a measurement. Ends in a token palette and a contrast policy you can defend.
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Map Projections
Flattening a sphere is impossible by Gauss's theorem, not by clumsiness, so every map is a choice about which invariant to break. Tissot's indicatrix makes the cost computable; the deliverable is a projection decision memo.
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Task Abstraction
Not whether a mark can be read but whether it should have been drawn at all, one level upstream of graphical perception. Brehmer & Munzner's why/what/how typology (2013) and the argument around it; the artifact is a task abstraction memo.
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Chess: Board Vision
The four questions a position asks before tactics do — what square is that, what does that piece attack, how many pieces hit it, and what is undefended — each drilled alone until it is automatic, then shuffled, because a game never tells you which one it wants. Five units, every one gated at eighteen of twenty held-out positions inside their cap.
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Seeds of tactical destruction — scanning a position
Board vision's sequel. Heisman's twelve seeds of tactical destruction — loose pieces, overworked defenders, an exposed king — named from memory under a cap, then read as evidence rather than an answer: four or more present is 85% tactical, two or three is the same as not looking. Gated at eighteen of twenty, except the calibration block, which cannot be: the features top out at 78%, against 29% for guessing quiet.