Abstract: DeckChair Tutor provides a scalable content management and online delivery system for the mastery of core competencies in the sciences, languages, and in any domain where both speed and accuracy are considered central to performance evaluation. This eLearning system’s tools allow publishers, authors and/or instructors to create and deliver multimedia lessons, simulate real-life scenarios, deliver tests, and assessments to train and measure time-critical decision making skills. Speed and accuracy performance measures are used to track learning, remediate deficiencies, and plan future learning objectives. DeckChair Tutor guides learners through a self-paced tutoring and rehearsal system in standalone and hybrid settings where assessment strategies are used to generate and deploy adaptive itineraries to truly individualize curriculum content. Highlighted is a pretest-posttest methodology to identify gaps in student skills to customize personalized interventions (i.e., adaptive learning) and explore the effects of different types of feedback and goal setting options.