This presentation builds the skills and confidence of health literacy professionals by offering practical guidance for selecting, validating, and culturally adapting health literacy assessment tools. It presents five actionable rules that practitioners can follow to determine whether a tool’s scores are appropriate for needs assessment, program planning, and evaluation across populations. By focusing on what scores mean for real-world decisions rather than on statistical techniques alone, the presentation will emphasize how validity evidence informs practice. The rules function as a rapid appraisal guide for frontline health literacy professionals seeking defensible measurement across public health.