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After four years of failing to define a new product by asking teachers what they wanted, Lego's B2B team finally succeeded when they built and showed them a prototype. This shows that for complex problems, building and demoing is more effective than traditional voice-of-customer interviews.

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The most valuable product use cases are often discovered not through surveys, but through deep, intellectually curious immersion into the customer's world. This means observing their environment and processes firsthand to understand latent needs they cannot articulate, as proven by the karaoke company story.

Instead of guarding prototypes, build a library of high-fidelity, interactive demos and give sales and customer success teams free reign to show them to customers. This democratizes the feedback process, accelerates validation, and eliminates the engineering burden of creating one-off sales demos.

AI development tools have radically compressed the product design cycle. Instead of presenting wireframes or mockups, teams can now arrive at initial stakeholder meetings with fully functional, data-connected demos, dramatically accelerating the feedback loop and decision-making process.

Early demos shouldn't be used to ask, "Did we build the right thing?" Instead, present them to customers to test your core assumptions and ask, "Did we understand your problem correctly?" This reframes feedback, focusing on the root cause before investing heavily in a specific solution.

In AI, low prototyping costs and customer uncertainty make the traditional research-first PM model obsolete. The new approach is to build a prototype quickly, show it to customers to discover possibilities, and then iterate based on their reactions, effectively building the solution before the problem is fully defined.

Voice of the customer research is often insufficient. Adopt iterative innovation by quickly creating and demoing cheap prototypes—even computer simulations or animated concepts—to get constant, early feedback. This validates ideas in real-time.

Accessible prototyping tools are changing product norms. The expectation is shifting from presenting detailed Product Requirements Documents to sharing interactive prototypes. This visual, hands-on approach accelerates discussions, improves decision quality, and makes ideas tangible for a wider audience.

To overcome leadership resistance to an internal tool, Walmart's PM built prototypes populated with actual production data. This tangible "what if" scenario demonstrated exactly what executives would see and the value they would get, proving far more effective than standard mockups for securing buy-in.

AI prototyping tools enable a new, rapid feedback loop. Instead of showing one prototype to ten customers over weeks, you can get feedback from the first, immediately iterate with AI, and show an improved version to the next customer, compressing learning cycles into hours.

Don't underestimate the power of a tangible, even if imperfect, prototype. A designer used AI tools to build a working demo of a complex concept (MCP server). This "vibe-coded" project made the abstract value concrete for leadership, directly leading to the technology being prioritized on the company's official roadmap.

Lego Education Proved Iteration Trumps Interrogation for Customer Needs | RiffOn