Since becoming one of the most widely used measures of student growth across the United States, student learning objectives (SLOs) have been examined in nine contexts and in more than a dozen studies. A companion piece to The Art and Science of Student Learning Objectives: A Research Synthesis, this annotated bibliography provides brief summaries of individual studies conducted in nine states and districts, highlighting general research context and questions, study methodology, and key findings. Each research summary is organized alphabetically by location and within location chronologically.