Developing a support group for freshman international students

Robert is interesting in developing a support group for freshman international students who are attending college in the U.S. and having difficulty acclimating. He is interested in looking at how this experience impacts anxiety, depression, and academic performance. He would like to sample at least 150 students and administer The Depression, Anxiety, and Stress Scale (DASS-21). Then implement a support group intervention and administer the DASS-21 again. This study be best described as