Appendix C — Conditional Jumps
A jump is legal only when the skipped stage is not a hard prerequisite for the proposed capability at the intended scale. Historical development does not prove that a stage is compulsory; neither does the ability to describe a shortcut prove that people, materials, institutions, or failure recovery exist.
C.1 The Five-Part Jump Test
A proposed jump passes only when all five questions have evidence-backed answers:
- Physics and materials: no unaccounted hard prerequisite is violated.
- Living knowledge: the needed theory, measurements, recipes, and failure data are held by real practitioners—not merely written in a book.
- Competence and facilities: trained people, tools, test equipment, safe facilities, and quality inputs exist.
- Institutional support: standards, finance, records, maintenance, supply, and accountability are available.
- Recoverable failure: if the shortcut stalls, the society can return to a workable lower rung without catastrophe.
C.2 Conditional Jumps
| Skip or compress | Why it may be legal | Entry requirements | Main risk | Control |
|---|---|---|---|---|
| Long Bronze Age → iron | Local ore and bloomery skill may avoid a tin-import economy | reliable charcoal, furnace skill, qualified forging and heat treatment | brittle iron, weak tooling, false metallurgy | keep limited copper/bronze where castability or corrosion resistance matters |
| Long development of logographic writing → designed alphabet | A purpose-built script can target a known language efficiently | phonology, teaching materials, durable media, many trained readers | designing around one language or excluding non-literate knowledge | test literacy and inclusion; preserve oral and visual record |
| Roman numerals → positional decimal | General arithmetic and accounting are easier to teach with place value | place-value pedagogy, digit forms, paper/abacus bridge, quality standards | unfamiliarity or mistaken “pure gain” claim | retain abaci as independent checks during migration |
| Long gas lighting transition → electric lighting | Electric grids can displace urban gas and improve control | generation, distribution, protection, meters, maintenance | stranded gas assets and weak grids | phase replacement by district; retain emergency lighting |
| Mechanical general-purpose computing → electronic | Electronic switching can replace many mechanical functions | logic, reliable devices, power, memory, software discipline | premature scaling and unmaintainable hardware | retain tested procedures and independent data backups |
| Film-only imaging → digital | Digital sensors can fit a semiconductor and software platform | fabs, optics, calibration, storage, colour science | loss of capability if lens and film expertise disappear | preserve selected film processes; require interoperable formats |
| Landline-first telecom → wireless/cellular | Wireless access can avoid some last-mile copper | spectrum regulation, RF engineering, switching, backhaul | interference, surveillance, fragile backhaul; cellular is not a total replacement | design redundant fibre and radio paths; test jurisdiction and interoperability |
| Canal era → early railway | A few strategic railways can carry bulk freight sooner | locomotives, permanent way, finance, maintenance, safe operations | weak alignment and single-route failure | retain strategic water transport as a redundant route |
| Sail refinement → steam assist | Steam can improve schedule certainty where fuel and maintenance exist | marine boilers, pressure controls, engine-room competence | fuel logistics and single-engine dependence | retain sail as emergency propulsion and test changeovers |
| Mature vacuum-tube consumer products → semiconductors | Solid-state devices can replace many consumer tubes | qualified silicon, planar process, contamination control, yield statistics | uncontrolled fab and maintenance burden | use tube circuits as conceptual and emergency fallback only where justified |
C.3 “Alphabet covers all speech” is not a jump criterion
An alphabet designed for a known language can encode its phonemes efficiently; no finite stock of ordinary characters literally represents all speech, dialect variation, prosody, gesture, and meaning. The relevant question is whether the script is adequate, teachable, and maintainable for its actual users.
C.4 Jumps That Commonly Fail
| Tempting skip | Why it fails |
|---|---|
| Skipping pottery or another controlled-heat vessel capability | Metallurgy, glass, lime, tile, refractories, and laboratory work all depend on controlled vessels and heat |
| Skipping precision measurement | Cylinders, pressure, chemistry, power, medicine, and electronics inherit their errors |
| Skipping public health before clinical medicine | Devices cannot compensate for continual exposure to contaminated water, waste, and infection |
| Skipping institutions and maintenance | Hardware does not scale beyond its procurement, funding, records, incentives, and repair system |
| Skipping coal/iron/steel capability to jump directly to oil and electronics | Drilling, pressure vessels, catalysts, motors, grids, and tools depend on prior industrial capability |
| Skipping semiconductor process control by starting with a transistor diagram | A one-off transistor does not establish yield, contamination control, metrology, safety, or maintenance |
| Direct fusion dependency | Fusion remains an incomplete technology; planning cannot assume schedule or cost certainty |
| Humanoid robots before structured automation | General manipulation remains harder than many constrained factory and logistics tasks |
| Money replaced by informal sharing or allocation at continental scale | Large cooperation still needs records, standards, dispute handling, and a way to express scarcity and priorities—though the form need not be coinage |
C.5 Jump Record
For every accepted jump, record:
- skipped stage;
- target scale and operating environment;
- hard-prerequisite analysis;
- living-knowledge holders;
- required competence and facilities;
- institutional owner and budget;
- acceptance test;
- failure signal and stop-work threshold;
- fallback capability;
- review date.
A jump is not “free” because history spent time there. It is efficient only when the saved time exceeds the new verification and coordination cost.