She also works as a tutor on campus earning enough money to support her extra costs. Because Shawna manages her own finances, we might assume that her life as an adult should be drawn as an ecological model separate from her parents. After all, her interactions with her school and the larger environment of scholarship and university funding take place completely separately from her parents' lives. A closer look, however, discloses a very real interdependence between higher education and the parents. If Shawna had to produce enough income to cover these costs herself, she would not be able to attend school full-time and the university would lose a top scholar.
Interdependence works two ways, of course.
If the university did not provide Shawna with a full scholarship, her parents would certainly be affected because their level of support for their daughter would be much higher. The influence of both parents and university on each other is indirect. They do not communicate and yet they are linked. As Shawna continues her education, perhaps by attending graduate school or professional school, her parents may continue to be interdependent with environments they will never directly experience. So, to ease the crowding, we can imagine multiple models that still show interdependence resulting from indirect influence.