How do focus groups work?

Focus groups have been widely used by organizations and individuals to find out how their products and ideas will be received by an audience. From the usage of household products to a politician's popularity, almost everything can be explored with this technique. But how are focus groups put together? And how did they come about in the first place? Hector Lanz explains how focus groups work. [Directed by Dmitry Yagodin, narrated by Addison Anderson].