Best times to find Models on campus

When searching for people to apply your lighting and posing skills, look into times between classes, particulary the 50 minute classes. People are more likely to have free time during that period so it is okay to ask for a couple of minutes of their time.
You may try to get people during changing periods but they are more likely to be moving to their next class or heading home. We don't want the models to have a hurrying mentality when photographing them because they have a schedule to stick to which causes less than optimal subject-photographer interaction. Also, when in these changing periods there is a mass crowd which can get in the way of your setup; it makes it difficult to maintain safety for ourselves, the models, and our equipment as people can run into our photographic location.
When students/faculty are outside during the middle of classes, it probably means that they have free time. They are perhaps on break, arrived early on campus, or waiting for another class. All which indicates that they have some free time.
For example, when classes start at 10:00 AM, the best time to look for models is around 9:30 AM. There are people walking by, probably with nothing to do, that would love to have their pictures taken (on a professional level. Hey, that's what we do).
As time nears changing period there will be an increase in crowd population, and people will have to start heading to their next classes. Chances of finding a model are less likely.