The evidence trail behind the trilogy. These pages collect the cited research, published engineering and practitioner sources, and direct professional communications behind each essay.

The trilogy also uses anecdotes and analogies alongside formal sources. Those moments are craft observations, not claims to scientific weight.

Direct personal communications are listed without external links.

Personal stories and first-hand examples are not listed as formal source entries unless a named person or public document is being cited. The Brian Kelly / Gibson L-5 item is listed as a personal communication because the named source confirmed the visible use before publication. The barbecue competition story is treated as author experience rather than a formal source.

Source list

Brian Kelly personal communication

Source
Brian Kelly, personal communication with Chris VenHaus, 2026.
Year
2026
Source type
personal communication
Link
No external link.
Why it appears
Gibson L-5 perspective anecdote. Source confirmed the visible Part 1 use before publication.

Interim Approval for Optional Use of Clearview Font for Positive Contrast Legends on Guide Signs

Source
Federal Highway Administration. (2004). Interim Approval for Optional Use of Clearview Font for Positive Contrast Legends on Guide Signs.
Year
2004
Source type
official guidance / design reference
Link
https://mutcd.fhwa.dot.gov/pdfs/ia_clearview_font.pdf
Why it appears
Official highway-sign source for the Clearview / Highway Gothic legibility and halation example.

Improving ratings

Source
Strathern, M. (1997). "Improving ratings": audit in the British University system. European Review, 5(3), 305-321.
Year
1997
Source type
concept / source mention
Link
https://doi.org/10.1002/(SICI)1234-981X(199707)5:3<305::AID-EURO184>3.0.CO;2-4
Why it appears
Public source for the common quoted formulation of Goodhart’s Law.

Transient distortion in transistorized audio power amplifiers.

Source
Otala, M. (1970). "Transient distortion in transistorized audio power amplifiers." IEEE Transactions on Audio and Electroacoustics, AU-18(3), 234-239.
Year
1970
Source type
technical history reference
Link
https://doi.org/10.1109/TAU.1970.1162117
Why it appears
Technical-history source for Otala’s transient-distortion work.