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Rigorous Test Development (RTD) is a ten-year-old methodological framework for developing items for large scale assessment that elicit evidence of the targeted cognition for the range of typical test takers. RTD was inspired by Evidence Centered Design (ECD) and picks up item development where ECD leaves off. RTD takes a validity-focused approach to test development by concentrating on the building block of all assessments: items. This paper presents the RTD’s New Core Principles (i.e., the first revision to the Core Principles since RTD’s launch) and RTD’s five Pillar Practices (i.e., Radical Empathy, Unpacking Standards, Item Review, Item Refinement, and Balancing Confidence and Humility) of item developers’/content specialists’ work.