Strategic Supplier Management era
In this era, representative scholars such as Monczka, Handfield, and Trent articulated strategic sourcing as a firm‑level capability, linking supplier development, performance‑based sourcing, and early supplier involvement with new product development. Empirical researchers Krause, Scannell, and Calantone demonstrated how structured supplier development programs and rigorous supplier performance measures improve quality, delivery, and competitive advantage. Methodological advances included the use of interpretive structural modeling (ISM), drawing on Warfield's framework to support supplier selection, configuration, and data‑driven evaluation. Martin Christopher and colleagues further integrated suppliers into strategic supply chains, emphasizing long‑term relationships, adaptability, and governance over transactional purchasing.