Everything on this page is fictional, a made-up shop with made-up products, built to show how the quiz works. When this gets built for a real business, every question and recommendation is sourced from that business's own published guides and live stock, the way the example below shows.
How this gets built for real
The questions come from the business's own guides, not invented rules. If a business already publishes a sizing chart, a fit guide, or a "how to choose" article, the quiz just asks what that guide already asks, one question at a time instead of one long page.
The recommendation checks real stock. A product only gets recommended if it's actually available in the size or option the quiz determined, not just theoretically in the catalog.
See it built for a real business: Ministry of Sight, a reading-glasses retailer.