3. Define criteria for the results list
Products that differ significantly in terms of minor features should be immediately apparent to shop customers. An online product advisor offers a reasoning function for this purpose. The reasoning function helps shop customers to immediately distinguish between applicable and non-applicable product features. The applicable and non-applicable product features are visually displayed in a clear format. Shop visitors can quickly see which features are available for which products and which are not.

Reasoning function of the baggage advisor in the Lufthansa WorldShop (source: screenshot from worldshop.eu) ¹
This feature is important to prevent zero-hit pages from appearing. It also allows products to be displayed that do not match the answers 100%. You should therefore define the degree to which the criteria must be met in order to be displayed in the results list. This is because it may well be the case that there is no product in your product catalog that is a 100% match for your customer's needs.
You can display the degree to which requirements are met in the results list, e.g., using percentages or by listing included and excluded components. This allows your customer to see immediately which criteria the products in the results list meet and avoids any negative surprises after purchase if a criterion is not met. You should also consider the must-have and nice-to-have criteria globally for guided selling. This is because the answer to one question may influence the next questions.
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Example: The appropriate neoprene suit is to be determined using guided selling. If, for example, male is selected as the gender in the first question, a jumpsuit should be excluded in advance in the next step, which deals with the shape, as this type is only available for women.