Substitute
Ask: what component, material, person, process, or rule could be swapped for something different?
Key takeaways
- What it is: Ask: what component, material, person, process, or rule could be swapped for something different?
- Why it works: Substitution forces the thinker to identify which elements of a system they are treating as fixed that are actually variable. Most design failures and missed innovations come from the invisible assumption that a particular element must stay as it is. Naming potential substitutes — even implausible ones — surfaces those hidden assumptions and opens the design space.
- Evidence: Plausible mechanism, limited direct outcome data.
- Avoid: Substituting only within the obvious category (replacing one material with a similar material) rather than across categories — "what if a person did what this software does?" is a richer substitution.
Why it works
Substitution forces the thinker to identify which elements of a system they are treating as fixed that are actually variable. Most design failures and missed innovations come from the invisible assumption that a particular element must stay as it is. Naming potential substitutes — even implausible ones — surfaces those hidden assumptions and opens the design space.
How to do it
- 1List the key components of your product, process, or problem.
- 2For each component, ask: "What else could do this job? What if we used a different material, person, or rule?"
- 3Include obviously implausible substitutes — they sometimes point to the real solution obliquely.
- 4Record all substitutes before evaluating any.
What the evidence says
MechanisticDivergent thinking research supports constraint relaxation — making implicit assumptions explicit — as a driver of creative ideas. SCAMPER operationalizes this for the Substitute dimension. The checklist approach as a whole is practitioner consensus.
Honest caveat: SCAMPER generates ideas but does not evaluate them; quality filtering requires separate domain judgment that the technique does not provide.
Common mistake
Substituting only within the obvious category (replacing one material with a similar material) rather than across categories — "what if a person did what this software does?" is a richer substitution.
IX Coach runs you through the Substitute lens with targeted prompts for your specific problem domain, so the questions are calibrated rather than generic.
Practice this with IX Coach →