The term "fidelity" is often used in educational contexts to describe the degree to which a practitioner follows the prescribed directions when delivering an instructional program (Sanetti & Kratochwill, 2009; Dane & Schneider, 1998). Within a Response to Intervention (RTI) framework, the term fidelity also extends to assessment and data entry practices (Mellard & Johnson, 2007). Fidelity within an assessment context is important; without it, it is difficult to determine whether results are an accurate representation of performance or a consequence of measurement error caused by inaccurate delivery of the assessment (NCRTI, 2011). This brief discusses the importance of fidelity within assessment administration, assessment evaluation, and data entry procedures. It also includes methods to maintain fidelity within these practices.