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College administrators construct learning communities for undecided students in order to help them make peer connections as they explore and decide on a major. However, the peer community development mechanisms and their associated major declaration outcomes are not well understood, especially in virtual instructional environments. We use Stochastic Actor-Based Modeling to examine the evolution of peer networks among first-year undecided students in order to understand community formation processes, especially peer selection and peer influence, and their associations with eventual major decision. Initial modeling suggests atypical community development processes occurring within the online learning community. Results will have implications for the ways undecided students connect with each other and the institution, as well as how curriculum is structured.