The purpose of this quantitative, quasi-experimental study was to determine if, and to extent, there is a statistically significant difference between pre and posttest critical thinking scores of U.S. Navy Operations Specialist A-school participants in an adaptive technology training environment and those in the traditional learning environment. The adult learning theory that guided this study was Mezirow's Transformative Learning Theory. The variables for the study were developed based on the well-known California Critical Thinking Skills Test. The U.S. Navy provided archival data consisting of 47 participants' critical thinking scores (overall critical thinking, analysis, evaluation, inductive reasoning, deductive reasoning, and inference). Research question one asked if there were differences between pretest and posttest scores within the participants in the adaptive learning technology environment and a paired-samples t-test and non-parametric testing did not demonstrate a statistically significant difference within the scores. The other six research questions asked if there were differences in scores between scores in the two learning environments. A two-way mixed ANOVA demonstrated a statistically significant increase of 2.47 points (95% CI, 0.667 to 4.25) between the traditional learning environment participants' pretest analysis subskill scores (M = 83.14, SD = 7.90) and posttest scores (M = 80.67, SD = 7.74), t(23) = 2.84, p = 0.009, d = 0.58. There was also a demonstrated statistically significant difference between the two learning environments in the control analysis posttest scores (M = 80.67, SD = 7.74) and experiment analysis posttest scores (M = 73.74, SD = 9.16), t (45) = 0.007, p = 0.007, d = 0.82. More work is needed in understanding how technology can foster critical thinking. [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.bibliotheek.ehb.be/en-US/products/dissertations/individuals.shtml.]