Managing School Absenteeism at Multiple Tiers: An Evidence-Based and Practical Guide for ProfessionalsSchool absenteeism is a pervasive and difficult problem faced by mental health and school based professionals. Even in mild forms, school absenteeism has been shown to be a significant risk factor for social, behavioral, and academic problems in middle childhood and adolescence, as well as psychiatric, economic, and occupational difficulties in adulthood. Problematic absenteeism has been examined for decades by professionals of many different