Prototype before PowerPoint: how to test a concept before investing

How do you test a concept before investing?

You test a concept by building a rough but real version of it and watching how the people who would choose it react. At IW Agency, we think a concept that has only lived in a deck has not been tested at all. Prototype before PowerPoint.

A slide describes an idea. A prototype lets someone experience it: a pack on a shelf, a homepage they can click, a short film, a service they can walk through. Reactions to an experience tell you about choice. Reactions to a description tell you about politeness.

We judge a concept prototype on three things:

• Real: close enough to the finished thing that people respond with feeling, not opinion.

• Small: cheap enough to throw away without a fight.

• Soon: early enough that what you learn can still change the decision.

Conclusion: If customers can't touch it, you haven't tested it.

Why isn't a strategy deck enough to validate an idea?

A deck isn't enough because it asks people to imagine a feeling, and brands are chosen on feeling. We think the test has to produce the emotion you want to measure, or it measures something else.

The deck habit is old and well documented. Steve Blank described the traditional launch model as a business plan with a five-year forecast, developed "all without getting much feedback from the people they intended to sell to" (Blank, Harvard Business Review, 2013). Lean start-ups reversed that. They test hypotheses, gather early and frequent customer feedback and show "minimum viable products" to prospects.

Tim Brown made the design version of the same argument. Companies, he wrote, are asking designers "to create ideas rather than to simply dress them up" (Brown, Harvard Business Review, 2008). A prototype is where that happens. It is thinking you can hold.

Fear is the wrong reason to test. The claim that 80 per cent or more of new products fail is, in Castellion and Markham's words, "a persistent myth". Empirical studies since 1977 put the rate at 40 per cent or less (Castellion & Markham, Journal of Product Innovation Management, 2013). We test to make a good idea sharper, not to dodge a statistic.

What does a good concept prototype look like?

A good concept prototype is the cheapest thing that still makes someone feel what the finished concept would make them feel. In our view, fidelity belongs where the decision is, and nowhere else.

For packaging, that means a mock-up placed among real competitors, because the shelf is the context. For a digital experience, a clickable front page and one key journey. For a new positioning, a handful of executions that carry the tone.

Rapid prototyping works far beyond brands. At four Kaiser Permanente hospitals, close observation of nursing shift changes, "combined with brainstorming and rapid prototyping", produced new procedures and software for handovers. The result was more time for nursing and better-informed patient care (Brown, Harvard Business Review, 2008).

Keep the rounds small and frequent. Jakob Nielsen argued that "3 studies with 5 users each" improve the result far more than "a single monster study with 15 users" (Nielsen, Nielsen Norman Group, 2000). Learn, change, show again.

Doesn't early testing kill bold ideas?

Early testing kills bold ideas when you test for approval, and protects them when you test for reaction. This is the strongest argument against prototyping, and it deserves a straight answer.

The worry is real. People judge the new against what they already know, and a distinctive idea can look strange at first sight. Ask a room whether they like a bold identity and you will often get the safe answer.

But the fault lies in the question, not the prototype. "Do you like it" measures comfort. "What does this say to you", "which one would you pick up" and "what would you expect to pay" measure meaning and choice. We think a prototype gives a bold idea its best chance, because people meet it as it would really appear.

That is how creative work gets defended in a boardroom. Evidence of what an idea makes people feel is harder to overrule than a designer's conviction.

Conclusion: Test for meaning, not approval. Then defend the idea.

Where does concept testing matter most for brands?

Concept testing matters most where the first encounter with a brand is short, sensory and decisive. We think that describes more categories every year.

Take Lucky Bait. In Sweden's strictly regulated beer market, all alcohol is sold through Systembolaget, so the shop carries a large share of the brand's work. A concept for a brand like that should be judged where it will live. Or Nordic Nest, where the job was to turn Designonline.com from a generic online shop into a premium brand experience. Premium is a feeling, settled in a few clicks rather than on a slide.

AI assistants make the moment shorter still. When an assistant has already narrowed the options, the brand has seconds to confirm the choice. That moment is worth rehearsing with real people.

What does this mean for your brand?

• Ban the concept-only deck: no investment decision on a concept that nobody outside the team has experienced.

• Prototype the expression, not the document: if the concept is a new positioning, test what your brand platform would look and sound like, not the platform text itself.

• Run three small rounds before one big one: five honest reactions, a change, five more.

• Ask about choice and meaning: drop "do you like it" from the discussion guide.

• Budget for throwaway work: a prototype you are afraid to bin is too expensive.

Frequently asked questions

What is concept testing?

Concept testing is showing an early version of an idea to the people it is meant for, before committing full investment. The idea can be a product, a brand, a service or a campaign. The aim is to learn how they react and why.

How many people do you need to test a concept?

For qualitative rounds, fewer than most teams assume. Nielsen recommends testing with no more than five users per round and running as many small rounds as you can afford. Larger samples belong later, when you need to size a market rather than understand a reaction.

Is concept testing the same as market research?

No. Market research typically measures attitudes, needs and market size. Concept testing measures the reaction to one specific idea in a form people can experience.

When is it too late to test a concept?

It is too late once the result can no longer change the decision. If production is booked and the launch date is public, you are validating, not testing.

Make it real before you make it big

A concept earns investment when people have felt it, not when they have read about it. Real, small and soon is a habit any team can adopt from the next project. If you have a concept you want to put in front of customers, write to us at hello@iwagency.com.

Sources

• Why You Only Need to Test with 5 Users — Nielsen Norman Group, 2000

• Why the Lean Start-Up Changes Everything — Harvard Business Review, 2013

• Design Thinking — Harvard Business Review, 2008

• Perspective: New Product Failure Rates: Influence of Argumentum ad Populum and Self-Interest — Journal of Product Innovation Management, 2013