The most direct way is to find someone who has never heard of your products, let them browse your current catalog or page, then ask: "Do you know what problem this product solves for you? Do you know the minimum order quantity and approximate price?" If they can't answer, or need you to explain, then that catalog is designed for existing clients, not new prospects. Common issues include: heavy use of industry jargon and internal part numbers, lack of use-case explanations, completely opaque pricing, and no clear entry point to request samples or submit inquiries. For new prospects, catalogs need to describe the problem the product solves in the buyer's language and provide a clear next step—such as requesting a sample or submitting an inquiry.