Question: When do you use “between” and when do you use “among”?
Use between to express group collaboration, whether there are two groups or more.
Example: The collaboration between the Universities of Shady Grove, Montgomery College, and Montgomery County Public Schools is very productive in terms of helping students succeed in college.
Also, use between to estimate a number in a group.
Example: Between 20 and 30 students gathered to sing.
There is another way to express an estimation of the number in a group:
Example: From three to six members may be chosen to perform.
Use among to talk about the members in one group.
Example: There is disagreement among the members of the choir about the colors that should represent the group.