This document presents the methodology for evaluating a minimum viable product (MVP) mobile application of the International Classification of Functioning (ICF) through multi-site user testing. The evaluation will assess usability, validity of functioning descriptions, and technology acceptance at test sites in multiple countries. Small groups of 30 users and 2-4 providers will provide feedback over 5 iterations to inform rapid app updates. Both formative and summative evaluations will gather opinions on information quality, system quality, and service quality. The results will contribute to evidence on health and quality of life impacts and efficiency gains from using the ICF mobile solution.