Extension's relevancy in the 21st century is dependent upon the organization's ability to adapt to internal and external pressures. Extension's responsibility to bridge LGUs and communities requires commitment from the entire university and the original agricultural Extension model must embrace an expanded portfolio including complex problems such as land use, obesity prevention, and urban revitalization. Few studies have been published that explore intercollegiate Extension and faculty perceptions of increased university engagement. The purpose of these studies was to explore intercollegiate Extension models. Since there is limited knowledge regarding intercollegiate Extension efforts, this research focused mainly on different models of intercollegiate engagement and perceptions of this nontraditional Extension approach. This research examined different U.S. LGU models for intercollegiate Extension engagement. The research objective was to understand the lived experience of Extension professionals at universities who adopted an intercollegiate Extension model or who are in the process of doing so. Successful intercollegiate Extension programs were described as aligning with the three-tier mission of LGUs and providing opportunities for teaching, research, and Extension. Previous literature also supported the important role leaders play in creating a supportive culture regarding intercollegiate Extension programs. Rethinking organizational policies arose as an important consideration for intercollegiate Extension programs. Particularly, intercollegiate Extension programs must help faculty in their pursuits of promotion and tenure. Furthermore, LGUs' county Extension offices can be leveraged to provide community-relevant programming that draws from disciplines across the university. LGUs should consider revising their approaches when developing and implementing intercollegiate Extension programs. The mission of LGUs to serve the public could serve as a catalyst for expanding Extension beyond agricultural colleges and encouraging collaboration across the university. Intercollegiate Extension programs could embrace LGUs' mission to provide relevant solutions for peoples' lives which, in the 21st century, requires interdisciplinary teams. Future studies could determine the advantages of intercollegiate programs regarding securing diverse funding, program impacts, and faculty willingness to engage with these programs. Many complex issues extend beyond disciplinary boundaries, so collaborations between LGU departments and colleges could be an essential step towards better quality research which is socially relevant and harnesses the collective power of LGUs. [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://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]