a standardized, step-by-step tool developed by OMERACT to guide researchers in selecting the most appropriate measurement instruments for their studies. It provides a systematic framework for evaluating instruments against the OMERACT Filter (truth, discrimination, feasibility), taking into account the construct being measured, the target population, study setting, and feasibility considerations. By following OFISA, users can make transparent, evidence-based decisions on whether an instrument meets the OMERACT standards for inclusion in a core outcome set.
Abbreviation: OFISA