Replacing ternary relationships

When a ternary relationship occurs in an ER model they should always be removed before finishing the model. Sometimes the relationships can be replaced by a series of binary relationships that link pairs of the original ternary relationship.
This can result in the loss of some information - It is no longer clear which sales assistant sold a customer a particular product.
Try replacing the ternary relationship with an entity type and a set of binary relationships.
Relationships are usually verbs, so name the new entity type by the relationship verb rewritten as a noun.
The relationship sells can become the entity type sale.

So a sales assistant can be linked to a specific customer and both of them to the sale of a particular product.
This process also works for higher order relationships.