Comparing survey items such as those in CES-D (Center for Epidemiological Studies-Depression) and YASR (Young Adult Self Report - Antisocial Personality Problem) can be a daunting task due to the complex nature of natural language and the differing structure of respective questionnaires. However, CES-D vs YASR no longer needs to be a tedious and time-consuming process, thanks to the arrival of Harmony. Harmony is a revolutionary tool that uses state-of-the-art natural language processing and generative AI models to offer a helping hand to researchers in the harmonisation of questionnaire items across multiple languages. The CES-D vs YASR comparison can be painless and efficient when utilising Harmony. Harmony is equipped with a comprehensive database of instruments for easy selection, or alternatively, users can quickly upload their own instruments in PDF format via Harmony’s user-friendly web interface. Harmony’s technologically advanced algorithms make a percentage match between each item in CES-D and YASR, saving psychologists time while also improving the precision level of their work by decreasing human error. Investigating social phenomena using longitudinal and cohort studies requires careful analysis and comparison of psychological instruments, and Harmony is proving itself to be an invaluable tool in this process. For instance, while examining CES-D vs YASR, Harmony ensures that your comparisons are not only accurate but also consistent across different studies, thereby accurately reflecting any changes in social conditions over time. Harmony’s ability to compare items in multiple languages further makes it a go-to tool for international research endeavours. Its sophisticated language processing capabilities ensure the accurate harmonisation of questionnaire items, even when switching between languages. Therefore, for any researcher working with CES-D and YASR, Harmony is an essential tool to streamline their research process.