Triz Inversion

---
name: triz-inversion
description: Invert or reverse the action, property, or perspective to solve a problem when conventional approaches fail
---

# TRIZ Inversion (Principle #13)

## Overview

Inversion is one of Genrich Altshuller's 40 Inventive Principles from TRIZ (Theory of Inventive Problem Solving), derived from analysis of over 200,000 patents. The principle states: reverse or invert the action used to solve the problem, or make stationary parts movable and movable parts stationary.

Inversion appears in three forms:
1. **Action Inversion** - Do the opposite of the expected action
2. **Property Inversion** - Reverse the property (hot to cold, push to pull)
3. **Perspective Inversion** - Turn the object or viewpoint upside down

The underlying insight: when conventional approaches fail, the solution often lies in doing the exact opposite. What seems counterintuitive frequently unlocks breakthrough innovations.

## When to Use

- Conventional solution attempts have reached diminishing returns
- The standard approach creates unintended negative consequences
- Physical constraints prevent the obvious solution
- You need to break mental fixation on a single approach
- The problem involves getting something out of a tight space
- Heat, force, or pressure applied normally doesn't work
- You need to question fundamental assumptions about how things "should" work

## The Process

### Step 1: Identify the Conventional Action

What is the standard, expected, or obvious way to solve this problem?

**Example:** To loosen stuck metal parts, heat the outer part to expand it.

### Step 2: Invert the Action, Property, or Perspective

Ask: what if I did the exact opposite?

- **Action Inversion:** Instead of heating, try cooling
- **Property Inversion:** Instead of expanding, try contracting
- **Perspective Inversion:** Instead of working from outside-in, try inside-out

**Example:** Cool the inner part instead of heating the outer part.

### Step 3: Analyze Why the Inversion Works

Understand the physics, psychology, or logic of why the opposite approach succeeds.

**Example:** Cooling the inner part causes it to contract, creating clearance for removal.

### Step 4: Test Edge Cases

Verify that the inverted solution works across expected scenarios and doesn't create new problems.

**Example:** Ensure cooling method doesn't damage materials or create condensation issues.

### Step 5: Generalize the Inversion Pattern

Document the insight for future applications in similar contexts.

**Example:** "When expansion doesn't work, try contraction" becomes a reusable heuristic.

## Example Application

**Situation (Manufacturing Defect):** Paint spray booth generates overspray waste that contaminates products and clogs filters.

**Application:**
1. **Conventional Action:** Move paint toward the object
2. **Inversion:** Make the object move to capture paint (electrostatic painting)
3. **Why It Works:** Charged object attracts paint particles, reducing overspray by 30-40%
4. **Edge Cases:** Requires conductive objects, managed humidity levels
5. **Pattern:** "Instead of pushing substance toward target, make target pull substance"

**Outcome:** Reduced paint waste by 35%, improved finish quality, lower filter replacement costs.

## Anti-Patterns

- Inverting without understanding why the original approach failed
- Applying inversion mechanically without considering context
- Ignoring safety implications of reversed actions (cooling with liquid nitrogen without ventilation)
- Assuming all problems have an inverted solution
- Over-complicating simple problems that don't need inversion
- Failing to test whether inversion actually improves the outcome

## Related

- triz-asymmetry (break symmetry rather than maintain it)
- triz-taking-out (extract rather than add)
- reversal-method (de Bono's lateral thinking technique)
- first-principles-thinking (question assumptions before inverting)
- pre-mortem (invert success planning into failure analysis)