This study was conducted by the Student Transitions Project (STP), a collaborative research partnership involving B.C.'s education and advanced education ministries and post-secondary institutions. The STP has collected twenty years of student data from twenty grade 12 graduation cohorts and twenty years of post-secondary enrolments. To celebrate this achievement, this report provides a twenty-year review of STP research findings, including trends in student transitions, enrolments, mobility and credential completions, along with some interpretation of those trends, concluding with future goals of the STP over the next twenty years. This report summarizes twenty years of STP research, covering STP's first B.C. grade 12 graduation cohort of 2001/2002 through to its twentieth cohort of graduates of 2020/2021, in addition twenty years of all B.C. public post-secondary enrolments, from 2002/2003 to 2021/2022. This report is organized as a series of broad research questions and answers, with detailed supporting tables of data provided in Appendix C. The Quick Facts section beginning on this page provides brief responses to each question, and the Research Results section of the report, beginning on page 12 gives more in-depth explanations with data visualizations. This report is also available to the public on the STP website.