This compendium, a deliverable for "Assessments for Social, Emotional, and Academic Learning with Preschool/Elementary-School Children," focuses on tools to assess the social and emotional learning (SEL) of preschool and elementary school students (i.e., five- to ten-year-olds), along with aspects of the contexts in which they learn and their learning behaviors. The assessment tools in this compendium have been gathered to provide researchers, especially educational and policy practitioners, a means to gauge the SEL skills of the preschool/elementary students in their care, as well as to evaluate contexts that promote SEL and its long-term outcomes. Many compendia of measurement tools are currently available, but this compilation has special value because (1) it follows the Collaborative for Academic, Social, and Emotional Learning's framework of SEL-related inputs; and (2) it is more comprehensive than most. The tools in this compendium are organized into three sections: (1) Aspects of School Context; (2) The Five SEL Core Competencies: Self-Awareness, Self-Management, Social Awareness, Relationship Skills, and Responsible Decision-Making; and (3) Academic-Related SEL Competencies. [This compendium was partially funded by the Rauner Family Foundation.]