This document summarizes four models of media effects:
1) Uses and Gratification Model - Views audiences as active in choosing media to fulfill needs and shape identities. It recognizes audience power but ignores social factors.
2) Cultural Effects Model - Views media as tool of dominant groups to gradually influence audiences based on factors like class, gender, ethnicity.
3) Hypodermic Syringe Theory - Views audiences as passive, with media having immediate effects on behavior. It does not recognize outside influences.
4) Two Step Flow Model - Views influence as from media to opinion leaders to audiences, recognizing audiences are not entirely passive but still assumes media ultimately shapes opinions. It does not fully recognize independent audience views.