Andrew Goodwin was a professor of media studies at the University of San Francisco who published the first comprehensive study of MTV in 1992 called "Dancing in the Distraction Factory", in which he analyzed the characteristics of music videos. Goodwin identified several defining characteristics of music videos including genre conventions, the relationship between lyrics and visuals, the use of star image motifs, intertextual references, and whether the video takes a performance, narrative or concept-based approach.