This design-based research study of library instruction was developed using the Community of Inquiry theoretical framework. Three different instructional approaches were developed and evaluated as part of this study: the one-shot session approach, the partially embedded librarian approach and the fully embedded librarian approach. Surveys, interviews and journaling were used to gather data from faculty, undergraduate students and the researcher-librarian about their experiences. This research study is unique given the combined use of design-based research methodology and the Community of InquiCoory theoretical framework to collaboratively design and evaluate library instruction.