ITC Harold teams are made up of students and graduates of the Impatient Theatre Co. and sometimes people who have also studied Harold-based improv at the iO Theater in Chicago or Los Angeles or with one of the many theatres in New York City that teaches the form, such as the Upright Citizens Brigade Theatre or the Magnet Theatre or The People's Improv Theatre.

At the ITC, we teach our students to let Harold form organically from the suggestion given at the top of each show. For example, if the suggestion is "palindrome", the Harold that the team performs might itself resemble the structure of a palindrome, ending in a very similar manner to which it began.

Harold is the most widely performed improv format in Chicago, New York City and Los Angeles. Harold has spawned numerous other forms, a number of these are taught at the Impatient Theatre Co.