The International Trade Commission (ITC) is as popular a forum as ever for patent infringement disputes in the U.S. In 2011, 70 investigations were instituted in the ITC under Section 337 of the Tariff Act of 1930. That number compares to 51 investigations instituted in 2010, and is the highest number of investigations ever instituted by the ITC in a single year. Part one of this series explains why the ITC has become an increasingly popular forum and addresses two basic technical requirements that must be met to institute an action there.