This qualitative study examines first-year college students' online search habits in order to identify patterns in millennials' mental models of information retrieval. The study employed a combination of modified contextual inquiry and concept mapping methodologies to elicit students' mental models. The researcher confirmed previously observed millennial behavior including preference for searching rather than browsing and hypertext reading. The study found three basic types of mental models; those with a network view conducted more searches overall and more complex (Boolean and topic + focus) searches. However, none of the participants demonstrated strong mental models that increased their effectiveness in searching. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]