That depends on what would make the most sense for your particular situation. In general, it is best to purchase for each person, but if it is feasible for some users to share a computer at a certain school, you can simply count that computer as a single user. On the other hand, ordering for each individual person would allow each person to install on both their home and school computers. I try to be flexible on that point because I want the software to be readily available and relatively cost-effective.