When working with questionnaires for social or psychology research, often a pivotal task is to compare and harmonise between different instruments. Harmony, a sophisticated software developed for psychologists, assists in this complex chore, especially when comparing Timeline-Followback Interview (TFLB) and History & Aetiology Schedule (HAS). Leveraging the power of natural language processing and AI, Harmony streamlines the ‘TFLB vs HAS’ work by comparing questions and items in these questionnaires, providing a percentage match. Harmony proves to be an effective solution for the ‘TFLB vs HAS’ comparison due to the enormous variety and complexity of subjects these two instruments cover, ranging from detailed alcohol consumption patterns recorded daily in TFLB to broad topics such as psychiatric and general medical history, educational background, and living conditions covered in HAS. The software swiftly and accurately harmonises these diverse and complex questionnaires, allowing researchers to make meaningful comparisons, thus paving the way for impactful research. Moreover, Harmony also stands out by enabling multiple language comparisons. While ‘TFLB vs HAS’ task can undoubtedly become daunting due to language complexities, Harmony alleviates these hurdles. Whether selecting preloaded instruments from Harmony’s database or uploading a PDF of your instruments, the process remains smooth and efficient. In psychology research, if you find yourself needing to analyse and compare questionnaires like TFLB and HAS, Harmony offers an optimized and elegant solution.