On any model a few people have touched, the same calculation ends up written more than once — the same DAX sitting under different names, often on different tables, because nobody knew the other one already existed. Tidying that up by hand is nerve-wracking: before you delete anything you have to chase down every visual, filter, and measure that points at it, or you break a report. This skill reads your PBIP directly, finds every set of duplicates, and writes you a report — before it changes a thing — showing each group, where the measures are used, and which one it suggests keeping (the one used most). Then it walks you through group by group: you pick the keeper, and it rewires every reference and retires the rest for you — run it with /duplicate-measures.