The authors evaluated how a group-based career intervention affected career network ties among Finnish adolescents as they made educational choices and prepared for their transition to secondary education. They examined the career-related network ties of 868 students during their last year in comprehensive school (junior high school) in a randomized field experimental study. The results indicated that immediately after the intervention, the group method lowered the density of participants' career networks, that is, the participants' network ties were less interconnected. The results further showed that about 6 months after the intervention, the program had increased the number of school counselors named as network ties. (Contains 2 tables.)