The Pareto Principle, also known as the 80/20 Rule, states that around 80% of outcomes are generated by 20% of inputs. In category management, this means that a small number of categories often account for the majority of total spend. Identifying these high-impact categories allows procurement professionals to focus resources where they deliver the most value. For example, managing a few strategic or high-spend categories rigorously may yield more savings and risk reduction than spreading efforts across all categories equally. The principle reinforces the need for prioritisation and focus in procurement strategies. While Six Sigma and Porter’s Five Forces are useful tools in other contexts, they are unrelated to spend distribution. Applying Pareto effectively helps organisations achieve better results with limited resources by focusing on what matters most.