The document outlines the process, challenges, and successes of reconstructing patient data using HMIS tools at a health site in Dandora, Kenya. Key steps in the process included assigning unique identifiers to active and inactive patients, entering patients into pre-ART and ART registers, and collecting monthly and cohort data. Challenges included unavailable patient data, conflicting sources, increased workload, and lack of personnel. Successes were having a unified register, accuracy, clarity, and accessible data. The way forward is replicating the tools nationwide and creating linkages between sites.