Almost three-quarters of instructors in America's higher education system are contingent faculty. Colleges and universities have increasingly relied on them as a flexible and cost-saving way to provide instructional services. Concerns over poor working conditions, low wages, and lack of job security have led to ongoing discussions about whether colleges should provide tenure appointments to contingent faculty, which could stabilize the teaching workforce. This report presents new evidence on the effectiveness of contingent faculty with tenure-track appointment--a group referred to as "teaching faculty." Results from the study serve as a first step toward understanding the promise of a dual-tenure-track model in creating a stabilized teaching force in research universities. Compared with their tenure-track research colleagues and lecturers, tenure-track teaching faculty in the sample assume a substantially larger teaching load yet produce comparable student outcomes. The dual-tenure-track model could limit institutional expenses while leading contingent faculty to stable employment, increased compensation and benefits, and better working conditions.