This study explored the types and uses of informal, on-the-job learning occurring among American Speech-Language-Hearing (ASHA)-certified Speech-Language Pathologists (SLPs) working in medical settings as part of a rehabilitation team. In addressing this purpose, a qualitative, phenomenological approach to research methodology was used. Participants were selected through a process of purposeful sampling, each meeting the criteria of having earned the Certificate of Clinical Competence in Speech-Language Pathology from ASHA and working in a medical setting as part of a rehabilitation team. Twenty-four SLPs from varying demographic profiles took part in one of three online data collection methods. Nine participants completed a computer-mediated interview, 11 participants completed an online journal entry and 4 participants completed a virtual focus group method. All data collection methods were accomplished via internet technologies. Data analysis was performed through a process of thematic analysis and resulted in four significant findings. First, both internal and external forces triggered SLPs to learn informally in the medical workplace. Also, SLPs went through an individually-determined, goal-directed process when learning informally in the medical workplace. SLPs used a combination of collaboration, workplace experience and research to learn informally in the medical workplace. And finally, SLPs employed informal learning activities for the purpose of meeting personal, patient and organizational needs. / It was recommended that (a) the American Speech- Language-Hearing Association review its professional development policy and consider implementation of a process whereby clinicians can document their goal-directed workplace learning and receive professional development credit for these activities; (b) healthcare organizations recognize, support and reward the informal learning in which their SLPs are already engaging; and (c) SLPs enhance their informal learning in the medical workplace through proactivity, critical reflectivity (of their own and others' learning), and creativity. The significance of this research included the use and support of existing theory in both Adult Education and Human Resource Development. Further, this research represents the first of its kind in investigating informal learning in rehabilitative therapies, specifically Speech-Language Pathology. Peer professions such as Physical and Occupational Therapy may also benefit from this study's conclusions and recommendations, as these professionals work in similar medical contexts. / by Patrick Roy Walden. / Thesis (Ph.D.)--Florida Atlantic University, 2008. / Includes bibliography. / Electronic reproduction. Boca Raton, Fla., 2008. Mode of access: World Wide Web.