TRIZ Contradiction Matrix Guide: From Engineering Conflicts to Inventive Principles
How to convert engineering conflicts like "requiring both strength and weight reduction" into parameter pairs for the Contradiction Matrix, and filter out executable Inventive Principles.
Step 1: Convert vague requirements into technical conflicts
The standard expression for a technical contradiction is "improving parameter A worsens parameter B." Phrases like "we need both strength and weight reduction" are not valid contradictions; only statements such as "increasing structural strength increases the weight of moving parts" qualify. The former cannot be queried, while the latter can be directly mapped to the Improvement and Worsening parameters in the Contradiction Matrix.
When conflicts arise, use the closest item from the 39 standard engineering parameters instead of creating custom parameter names. Parameter selection deviation is the primary cause of matrix query failures.
Step 2: Filter Inventive Principles
Matrix intersections typically yield 3–4 recommended principles, but recommendation does not guarantee feasibility. For each principle, ask three questions: Is there a known implementation of this principle in our industry? What additional resources are required to implement it? Does it conflict with existing process constraints?
After filtering with these three questions, typically only 1–2 solutions remain worth exploring. Documenting the exploration process is more valuable than memorizing principle numbers.
Step 3: Use with physical collision
When a single parameter must simultaneously satisfy opposing states (e.g., "temperature must be both high and low"), it constitutes a physical contradiction. Apply separation principles—time, space, condition, or whole/part separation—rather than the Contradiction Matrix.
A common mistake in practice is forcing physical conflicts into technical ones, leading the matrix to suggest irrelevant principles. First identify the conflict type, then select the appropriate tool.
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