Most uses in the university environment can probably be characterized as nonprofit educational uses
if the use is transformative rather than verbatim copying.
Fair use does not apply to some works, such as standardized tests, workbooks, and works that are meant to be consumed
If there is only one way or very few ways to express a fact or an idea, the expression is said to have merged into the fact/idea, and there is no copyright protection for the expression.
Although there are no numerical or percentage limits, the larger the amount of a work one uses, the less likely it will be fair use.
The more of the original taken, in amount and substantiality, the greater the negative impact on the market for the copyrighted work.
anticipated effect of the use on the publisher’s market
This factor is often cited as the most important of the four, although the factors all interrelate and must be evaluated in conjunction with each other.
Instead, we are compelled to return to the four factors and to reach reasoned and responsible conclusions about the lawfulness of our activities
If most factors lean in favor of fair use, the proposed use is probably allowed