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:

Action Inversion - Do the opposite of the expected action
Property Inversion - Reverse the property (hot to cold, push to pull)
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:

Conventional Action: Move paint toward the object
Inversion: Make the object move to capture paint (electrostatic painting)
Why It Works: Charged object attracts paint particles, reducing overspray by 30-40%
Edge Cases: Requires conductive objects, managed humidity levels
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

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)