This portfolio summarizes best practices in special education assessment and intervention. It discusses two key issues: Response to Intervention (RTI) and avoiding disproportionality in special education assessment. RTI uses multi-tiered interventions and assessments to identify student needs early. This avoids misplacing students in special education without adequate general education supports. The portfolio is intended to provide an exemplar for schools to reference in improving their special education practices and assessments. It suggests training practitioners in special education and general education to validate assessment data and avoid erroneous special education placements.