The purpose of this study was to investigate the influence of the technology and project-supported Thinking Journey on 11th grade high school students' achievements in the subject of electricity units. The participants were 68 high school 11th grade students from two different science classes. Control and experimental groups were selected at random. The data collection tools were the Electricity Achievement Test consisting of 39 multiple-choice questions and a semi-structured interview form. In the study, the experimental group was taught using the technology and project-supported Thinking Journey while the control group was taught using teacher-centered teaching methods. The Electricity Achievement Test was applied as pre-test and post-test to both experimental and control groups. The data were analyzed with independent group t-tests. Findings suggest that a significant difference was found between the experimental and control group students' Electricity Achievement post-test mean scores in favor of the experimental group with respect to sub-dimensions of Bloom's taxonomy. According to the analysis of the interviews, the experimental group students reported their satisfaction with the applications in the study. (Contains 2 figures and 3 tables.)