This article give the four factors and possibly a fifth factor used to resolve fair use disputes. It also includes information about acknowledgement and too small amount use.
This website from Stanford gives question answer approach to Copyright and Fair Use Research. I found this website very resourceful because it gives information about the common terms associated with copy right and fair use. The information from this website was also taken from a book called Getting Permission (October 2010) by Richard Stim.
The article outlines how teachers should present media to class and rules to follow so they don't violate copyright laws when taping shows to show to their students in class. The four factors he outlines for material to be considered fair use includes the purpose for use, the nature of the work, the amount used and the effect on the value of the work. Overall, this article gives a detailed guide of how teachers can keep themselves safe when presenting media to students.
Examples of fair use of copyrighted materials include quotation of excerpts in a
review or critique, or copying of a small part of a work by a teacher or student
to illustrate a lesson.