The Success Gaps Handbook: Addressing Equity, Inclusion, and Opportunity (hereafter referred to as the Success Gaps Handbook) is part of the overarching resource, Success Gaps Toolkit: Addressing Equity, Inclusion, and Opportunity (hereafter referred to as the Success Gaps Toolkit). The IDEA Data Center (IDC) developed the Success Gaps Toolkit to support district or school leaders in conducting a root cause analysis when there are inequitable outcomes among groups of students or success gaps, which are differences in one or more outcome measures between groups of children in a district or school. Root cause analysis is the process of discovering the root causes of problems in order to identify appropriate solutions. By taking a closer look at their educational system to prevent or address problems such as success gaps, district or school leaders work to ensure an equitable education for all children