The purpose of this qualitative embedded multiple case study was to describe what instructional strategies corporate instructional designers were using to design mobile learning and to understand from their experiences which instructional strategies they believed enhance learning. Participants were five instructional designers who were actively engaged in the development of one or more mobile learning applications. Participants were identified through a snowball sampling recommendation of a potential participant the researcher met at the 2012 Learning Guild Mobile Learning Conference. Data were collected from three data sources: (a) individual interviews; (b) physical artifacts; and (c) high-level design artifact documents. Interviews were digitally recorded and professionally transcribed. Physical artifacts and high-level design artifact documents were analyzed by the researcher who used an observation protocol to identify themes of instructional strategies and learning theories. Data were analyzed using NVivo 10 software. Theories and instructional strategies used by instructional designers of mobile learning in corporate settings were identified from the findings. Findings indicated that the mobile learning instructional designers in this study had know formal education related to designing mobile leaning instruction, but had acquired their skills through on-the-job experiences. Participants revealed their most satisfying mobile learning experiences. Limitations for the study were identified. Implications for practice were reported and recommendations for future research were made. Current and future instructional designers of mobile learning for corporations may benefit from this study's findings. This study added to the mobile learning instructional design literature. [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/en-US/products/dissertations/individuals.shtml.]