- Allow users to immediately identify products that are unavailable, with no possibility of confusion.
- Avoid disappointment of when a user starts a purchase, only to discover later on that the product they want is not available.
Specify, in the content for each product, a text or graphic note for "unavailable" or "available".
In the product pages:
- Check that there is text on the availability of products;
- Or check that there is graphic indication differentiating available from unavailable products (icon, colour, etc.) accompanied by an appropriate text alternative.