A fair use of video in lesson

A fair use of video in lesson will involve balancing other factors, including:
- the nature of the work,
- the amount used,
- the effect of the use on the concrete work.
Also, the video must be confident and suitable for the educational environment.
The chosen video must be suitable for the educatonal goals and for the purposes of analysis.
It should be not too long and not at all difficult.
The message of the film should be clearly and easily perceived by the students, acording to their age and disponibility for learning.