School-based practitioners are to implement and report functional behavior assessments (FBAs) that are consistent with both the research literature and the law, both federal and state. However, the literature regarding how best to document the FBA process is underdeveloped. A review of applied behavior analytic and school psychology literature as well as legislation and case law informs FBA reporting practices regarding (a) required content, (b) graphing of data, (c) organization of reports, and (d) clarity of language. The purpose of FBA reports is discussed, and this discussion explicitly informs the use of a solution-focused approach to improve clarity in report writing. Recommendations for best practices in FBA report writing are provided, and future research needs are highlighted.