This National Science Foundation project grant of $119,984 will support the development and study of reflection exercises and vignettes to promote the acquisition of professional dispositions among undergraduate computing students. Awarded under the NSF's STEM Education program (CFDA 47.076), the two-year project is led by the University of New Hampshire in partnership with three other institutions. The multi-institutional team will build on prior work to design reflection exercises and a suite of 50 vignettes targeting ten key dispositions including meticulousness, inventiveness, and responsibility. They will administer surveys and reflections over four semesters to evaluate the effectiveness of the exercises and vignettes in diverse contexts. The project aims to advance evidence-based approaches for developing professional behaviors critical for computing careers. Results and materials will be disseminated to computing educators and researchers.