This report delves into the significance of the adage "You can't manage what you don't measure" within the context of purchasing principles. It meticulously examines the six core principles: right quality, right time, right quantity, right price, right source, and right place. The report elucidates how these principles impact business management and customer satisfaction. Each principle is analyzed with exemplary scenarios, such as an ice-cream manufacturing company, to illustrate practical applications and performance measures. Furthermore, the report acknowledges potential negative consequences of these measures in the long term, emphasizing the importance of strategic planning and continuous assessment. References from academic sources are included to support the analysis.