---
name: technology-progression
description: >
  Design technology trees, innovation pathways, and the relationship between technology and
  society. Reference when defining what tools exist, what's possible to build, how innovation
  happens, and how technology interacts with the fantasy system.
metadata:
  author: nirav
  version: "1.0"
compatibility: Designed for Claude Code
---

# Technology Progression — The Tools They Build

Technology is not a linear march from primitive to advanced. It's a tree with branches, dead ends, and unexpected cross-pollinations. A civilization's technology tells you what problems they faced, what resources they had, and what they valued enough to invest in solving.

## Tech Tree Patterns

From game design research — three structural patterns for how technologies relate:

### The Vine (Civilization-style)

```
             ┌── Navigation ──── Cartography
             │
Bronze ──── Iron ──── Steel ──── Metallurgy
             │                       │
             └── Agriculture ──── Irrigation ──── Aqueducts
```

**Character**: Interlocking prerequisites. Multiple techs feed into and enable each other. Cross-branch connections create "eureka" moments where progress in one field unlocks another.

**Best for**: Worlds where technology is deeply interconnected. Where breakthroughs cascade. Where controlling one branch gives leverage over others.

### The Linear Path (Specialization)

```
Bow → Longbow → Crossbow → Musket → Rifle → Automatic Rifle

Sail → Carrack → Galleon → Clipper → Steamship → Dreadnought
```

**Character**: Each tech is a direct upgrade to the previous one. Separate branches don't interact. Specialization within a domain.

**Best for**: Military technology, where each generation obsoletes the last. Civilizations focused on one domain. Stories about arms races.

### The Dual Tree (Civilization VI)

```
TECHNOLOGY TREE                    CIVICS TREE
(physical tools)                   (social tools)

Writing → Printing                 Code of Laws → Civil Service
    ↕ cross-links ↕                    ↕ cross-links ↕
Astronomy → Telescope              Philosophy → Theology
```

**Character**: Technology and culture progress on parallel tracks. Cultural/political development is NOT a subset of technology — it's a separate progression that sometimes interacts.

**Best for**: Worlds where social organization matters as much as physical tools. Stories about the gap between technical capability and social wisdom.

## Designing a Tech Level

### The Five Domains

Every civilization's technology can be described across five domains:

| Domain | What It Covers | Key Question |
|--------|---------------|--------------|
| **Materials** | What can they shape and build with? | Stone, bronze, iron, steel, composites, magical materials? |
| **Energy** | What powers their tools? | Muscle, wind, water, fire, steam, electricity, fantasy system? |
| **Information** | How do they store and transmit knowledge? | Oral, written, printed, telegraphed, networked? |
| **Transport** | How far and fast can they move things? | Walking, horse, sailing, rail, flight, FTL? |
| **Medicine** | How do they treat injury and disease? | Herbalism, surgery, germ theory, genetic engineering, magical healing? |

A civilization doesn't need to be at the same level in all five. A culture might have advanced information technology (printing press, libraries) but primitive medicine (herbalism only). These asymmetries are where interesting worldbuilding lives.

### The Fantasy System as Technology Disruptor

| If the fantasy system provides... | Technology is disrupted in... |
|----------------------------------|------------------------------|
| Healing | Medicine is obsolete or split (magical vs. mundane healthcare) |
| Communication | Information domain leaps ahead; politics centralizes |
| Flight | Transport transforms; geography matters less |
| Material transformation | Materials domain is reshaped; alchemy replaces mining |
| Energy | The energy domain is replaced; industrial revolution may never happen |

The key question: **Does the fantasy system replace technology or supplement it?**

- **Replaces**: Technology stagnates where magic works. Innovation happens only in domains magic doesn't cover. Medieval stasis becomes logical.
- **Supplements**: Technology and magic coexist. Innovation combines both. Magitech. The most complex but richest option.
- **Competes**: Magic and technology serve the same needs but with different trade-offs. Political factions form around each. Conflict between traditionalists and innovators.

## Innovation Dynamics

### Why Civilizations Innovate

Innovation requires all three:
1. **A problem** — something scarce, dangerous, or inefficient
2. **Resources** — materials, knowledge, and time to invest
3. **Incentive** — why solving this problem matters more than other problems

If any of these is missing, innovation doesn't happen in that domain. This explains technological asymmetry: a civilization rich in water doesn't innovate in water technology.

### Why Civilizations Stop Innovating

- **The problem was solved** — good enough is the enemy of better
- **The cost exceeds the benefit** — diminishing returns on further improvement
- **Institutional resistance** — guilds, religions, or governments that benefit from the current level
- **Knowledge loss** — war, plague, or political upheaval destroys the people who knew how
- **The fantasy system makes it unnecessary** — why build aqueducts when mages can conjure water?

Stagnation is not laziness. It's a rational response to incentive structures. If you want to explain why a civilization hasn't advanced in a domain, find the structural reason.

## Common Mistakes

1. **Linear progress assumption.** Technology doesn't always advance. Civilizations lose technology all the time. The Romans had concrete; medieval Europe didn't.
2. **Fantasy medieval stasis without explanation.** If magic exists for 10,000 years and nobody invents a printing press, explain why. (Magic makes individual knowledge transfer more efficient? The fantasy system's cost discourages mass production?)
3. **Technology without social consequences.** The printing press didn't just make books cheaper — it shattered the Church's monopoly on knowledge, enabled Protestantism, and restructured European politics. Every technology has social consequences.
4. **Anachronistic mixing.** Plate armor and muskets coexisted historically, but katanas and laser rifles need an explanation. Unless the anachronism IS the worldbuilding (which can work brilliantly).