This dissertation describes the overall effectiveness of deception detection training and identifies conditions that may enhance training effectiveness through understanding how adults learn and utilizing scenario-based training. The analysis was based on a total of 1,788 evaluation data sheets (archival records). The major aim of the research is to share information on scenario-based training in deception detection and information elicitation and its utility in training adult learners. In the process of researching and writing this dissertation, the author conducted a literature search and review on deception detection, adult learning, and scenario-based learning. This dissertation is slated to be a reference and resource for military, security, and law enforcement settings. [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.]