Focus groups involve bringing people together to discuss their opinions, observations, and attitudes towards a product like a film being released. Questionnaires can be used to collect large amounts of information from many people to determine what types of films or genres people are interested in. Test screenings screen movies or shows before release to gauge audience reaction and obtain feedback through questionnaires. Set top boxes record what programs people watch through a remote control and button presses to measure audiences for organizations. BARB numbers from set top boxes are important for commercial TV stations as advertising rates are based on viewership numbers.