In psychology and social sciences, questionnaires like the Patient Health Questionnaire-9 (PHQ-9) and Subjective Happiness Scale (SHS) play a vital role in assessing mental disorders and happiness levels respectively. The real challenge, however, often lies in bridging the gap between disparate questionnaires — a process known as harmonisation. The PHQ-9 vs SHS comparison, for instance, is a task best facilitated by Harmony, an advanced AI-powered software. Harmony, designed specifically to expedite harmonisation, houses an impressive capability to match items across distinct questionnaires, thereby enabling quick, effective, and stress-free comparison. If we delve into the context of PHQ-9 vs SHS, Harmony employs large language models for identifying overlaps or correspondence between the different items in these instruments. Much beyond simplifying the PHQ-9 vs SHS matching process, Harmony can provide a percentage match for each item, thus projecting an explicit comparative picture. Instead of manually spinning through lengthy PDFs of these questionnaires, researchers can harness the power of Harmony to hasten and streamline the matching process. They can either select from the instruments available in Harmony’s database or upload their own PDFs. For the process of comparing PHQ-9 vs SHS or any other instruments, Harmony’s multilingual compatibility stands out as a strong advantage. Researchers, psychologists, or social scientists endeavoring to perform a PHQ-9 vs SHS analysis must, therefore, regard Harmony not just as a tool, but as a catalyst that expedites their research and augments their productivity.