All sources

Ideas and evidence outside the project

1. Buffett, 2008 letter to shareholders (page 4: 'Price is what you pay; value is what you get')
   https://www.berkshirehathaway.com/letters/2008ltr.pdf (chapter 2)
2. Buffett, 1987 letter to shareholders (Mr Market)
   https://www.berkshirehathaway.com/letters/1987.html (chapter 2)
3. Buffett, 1993 letter to shareholders (voting machine, weighing machine)
   https://www.berkshirehathaway.com/letters/1993.html (chapter 2)
4. Margin of safety (financial), Wikipedia
   https://en.wikipedia.org/wiki/Margin_of_safety_(financial) (chapter 2)
5. Buffett, 1996 letter to shareholders (circle of competence)
   https://www.berkshirehathaway.com/letters/1996.html (chapter 5)
6. Circle of competence, Wikipedia
   https://en.wikipedia.org/wiki/Circle_of_competence (chapter 5)
7. Rappaport and Mauboussin, Expectations Investing (book site)
   https://www.expectationsinvesting.com/ (chapter 7)
8. Tversky and Kahneman (1974), Judgment under Uncertainty, Science
   https://www.science.org/doi/10.1126/science.185.4157.1124 (chapter 8)
9. Anchoring effect (the wheel experiment described), Wikipedia
   https://en.wikipedia.org/wiki/Anchoring_effect (chapter 8)
10. Northcraft and Neale (1987), Experts, Amateurs, and Real Estate
    https://www.sciencedirect.com/science/article/abs/pii/074959788790046X (chapter 8)
11. Nickerson (1998), Confirmation Bias
    https://journals.sagepub.com/doi/abs/10.1037/1089-2680.2.2.175 (chapter 8)
12. Simmons, Nelson and Simonsohn (2011), False-Positive Psychology
    https://journals.sagepub.com/doi/10.1177/0956797611417632 (chapter 8)
13. Kerr (1998), HARKing
    https://journals.sagepub.com/doi/10.1207/s15327957pspr0203_4 (chapter 8)
14. Chan et al. (2004), Selective reporting of outcomes in randomized trials, JAMA
    https://jamanetwork.com/journals/jama/fullarticle/198809 (chapter 8)
15. Kaplan and Irvin (2015), Likelihood of Null Effects of Large NHLBI Clinical Trials Has Increased over Time, PLOS ONE
    https://doi.org/10.1371/journal.pone.0132382 (chapter 8)
16. Nosek et al. (2018), The preregistration revolution, PNAS
    https://www.pnas.org/doi/abs/10.1073/pnas.1708274114 (chapter 8)
17. Hindsight bias, Wikipedia (Fischhoff 1975; Fischhoff and Beyth 1975)
    https://en.wikipedia.org/wiki/Hindsight_bias (chapter 12)
18. Parasuraman and Riley (1997), Humans and Automation: Use, Misuse, Disuse, Abuse
    https://journals.sagepub.com/doi/10.1518/001872097778543886 (chapter 13)
19. Dead man's switch, Wikipedia
    https://en.wikipedia.org/wiki/Dead_man%27s_switch (chapter 18)
20. Healthchecks.io documentation (alarm on a missing ping)
    https://healthchecks.io/docs/ (chapter 18)
21. Ward and Beyer (2014), BeyondCorp: A New Approach to Enterprise Security, ;login:
    https://www.usenix.org/publications/login/dec14/ward (chapter 19)
22. Saltzer and Schroeder (1975), The Protection of Information in Computer Systems
    https://www.cs.virginia.edu/~evans/cs551/saltzer/ (chapter 20)

Read from the repository

These are files in the project's own repository, which is public at https://github.com/franke112/value-screen-sentinel. They are named so that anyone can check each claim against the line it came from.

1. The tool's universe files and their count — config/universe/, VSS-PROJECT-BRIEF-2026-09-10.md §4.6 (chapter 1)
2. The owner's description of the project, verbatim — the brief for this site (chapter 3)
3. What automated steps may and may not do — reference/FRAMEWORK-EDITS.md rulings E92, E93, E97; README.md (chapter 3)
4. Screener design and rulings — reference/FRAMEWORK-EDITS.md E2, E6, E43, E44, E45, E52, E93, E96, E97; config/screener_filter2.yaml; vss/screen.py; vss/filters.py (chapter 4)
5. Gates, hard kills and the circle rulings — reference/FRAMEWORK.md §3–§4; reference/FRAMEWORK-EDITS.md E27, E30, E51, E96, E97, E99 (chapter 5)
6. Primary-source and provenance rulings — vss/source.py; reference/FRAMEWORK.md §5 basis rule; reference/FRAMEWORK-EDITS.md E19, E20, E22, E25, E40, E98; vss/overview.py (the unit seam); vss/series_sanity.py (ruling K4) (chapter 6)
7. The reverse DCF engine and the hurdle rate — vss/valuation.py; reference/FRAMEWORK-EDITS.md E28, E29 (chapter 7)
8. The pre-registration rule — reference/FRAMEWORK-EDITS.md E28, E95; reference/growth-views/ (chapter 8)
9. The three-outcome rule at each layer — reference/FRAMEWORK.md §0 rule 2; vss/rules.py (verdict and blocker codes); vss/universe.py; config/screener_filter2.yaml; reference/FRAMEWORK-EDITS.md E85, E99 (chapter 9)
10. Statuses and the rulings that govern moves between them — vss/rules.py; vss/watch.py; reference/FRAMEWORK-EDITS.md E12, E27, E93, E111, E114 (chapter 10)
11. Rules for the buy price, the tiers and the stop — reference/FRAMEWORK.md §0 rule 4, §4.4, §5.3, §6.4; reference/FRAMEWORK-EDITS.md E29, E39, E87, E90; vss/rules.py; vss/valuation.py (chapter 11)
12. The shadow book ruling and code — reference/FRAMEWORK-EDITS.md E114 (2026-09-08, amended 2026-09-09); vss/shadowbook.py (chapter 12)
13. What each automated step may and may not do — README.md; reference/FRAMEWORK-EDITS.md E92, E93, E97; vss/refresh.py; vss/screenwatch.py; vss/overview.py (chapter 13)
14. Module layout and each module's stated scope — vss/*.py module docstrings; vss/__main__.py; README.md (chapter 14)
15. The record, the run record and the store — vss/store.py; vss/runrecord.py; vss/snapshot.py; vss/manual.py; vss/runner.py; reference/FRAMEWORK-EDITS.md E17, E25, E40, E49, E85, E104 (chapter 15)
16. The framework, the rulings and the backlog — reference/FRAMEWORK.md; reference/FRAMEWORK-EDITS.md (A1–A3, B1–B48, C1–C4, D1–D2, E1–E114, F1–F2); reference/BACKLOG.md; config/screener_filter2.yaml (chapter 16)
17. The scheduler units and scripts — deploy/vss.timer, deploy/vss.service, deploy/vss-screen.timer, deploy/vss-checkin.timer, deploy/vss-failure@.service, deploy/vss-ping-healthcheck.sh, deploy/vss-notify-failure.sh, deploy/README.md (chapter 17)
18. The heartbeat module and the units — vss/heartbeat.py; deploy/vss-checkin.timer; deploy/vss-ping-healthcheck.sh; deploy/vss-notify-failure.sh; deploy/vss.env.example; reference/BACKLOG.md B-13 (chapter 18)
19. Ruling F1 and the tunnel notes — reference/FRAMEWORK-EDITS.md F1; deploy/TUNNEL-NOTES.md; deploy/vss-tunnel.service; deploy/vss-overview.service (chapter 19)
20. The boundary, as recorded — deploy/TUNNEL-NOTES.md; deploy/vss-overview.service; reference/FRAMEWORK-EDITS.md F1 limb (b) (chapter 20)
21. The overview page generator and its rulings — vss/overview.py; vss/render.py; reference/FRAMEWORK-EDITS.md F1, F2 (chapter 21)
22. The recorded limits — deploy/TUNNEL-NOTES.md; vss/heartbeat.py (what is not covered); reference/FRAMEWORK-EDITS.md E28, E29, E99, F1, F2 (chapter 22)
23. The rulings cited in this chapter — reference/FRAMEWORK-EDITS.md E30, E114, F1, F2; VSS-PROJECT-BRIEF-2026-09-10.md §0–§1 (chapter 23)

How the site itself was designed

The choice of a chaptered site over a single page, the pattern used for each kind of content, the colour system and the accessibility checks are recorded with their sources and their costs in the file RESEARCH-NOTES.md that ships beside these pages.