EXAMPLE: The Pope family sues Durable Paperboard Company for using chemicals that contain carcinogens in phone repair products. Two other companies use the same chemicals and fear that a decision adverse to Durable will result in many lawsuits against them based on the same claim. The companies therefore seek to intervene in the suit between the family and Durable.Source: Barron's Dictionary of Legal Terms, Steven H. Gifis, 5th Edition; ©