Any promotional piece included in a product shipment. It may be for different products (or refills and replacements) from the same company or for products and services of other companies.
By limiting the package insert campaign to a specific number of inserts with the same key or identifying number, it is possible to track and record the response to the specific campaign and to evaluate results based on the cost of the campaign.
A package insert program is recommended, i.e. the systematic practice of conducting individual package insert campaigns.