Purchasing is the operational core of procurement: the organised acquisition of goods and services needed to sustain production and operations at the required quality, quantity, time, and cost. This paper presents an integrated conceptual review of the purchasing function across four interrelated domains: the procedural stages of the acquisition and bidding process, from bidder selection through technical and commercial evaluation to post-award administration; the interdependency of purchasing with supply chain management, vendor relationship management, financial management, quality assurance, and risk management; the financial and administrative disciplines of cost management, financial-statement analysis, and contract administration that connect purchasing decisions to organisational financial performance; and the cross-border dimensions of global sourcing, regulatory compliance, and the ethical principle of good faith that governs buyer-supplier conduct. Drawing on established purchasing and supply-chain-management scholarship, the review argues that purchasing performance depends on treating these domains as a single governance system rather than as sequential or siloed functions, since weaknesses in financial, quality, or risk oversight typically surface first as failures in the bidding and award process. The paper concludes with recommendations for integrating financial and quality criteria explicitly into bid evaluation and identifies the comparative effectiveness of formal supplier-diversification strategies in mitigating global-sourcing risk in resource-constrained economies as a priority for future empirical research.

References

 Betz, F., Schreiber, H., & Riesener, M. (2018). Towards an extended purchasing performance measurement system: Aligning purchasing and corporate goals. In Proceedings of the 27th International Conference on Management of Technology (IAMOT 2018) (pp. 1–13).

 Burt, D. N., Dobler, D. W., & Starling, S. L. (2018). World class supply management: The key to supply chain management (8th ed.). McGraw-Hill Education.

 Carter, P. L., Monczka, R. M., & Handfield, R. B. (2015). Purchasing and supply management: Creating the vision. Supply Chain Management: An International Journal, 20(2), 231–233. https://doi.org/10.1108/SCM-01-2015-0026

 Chopra, S., & Meindl, P. (2019). Supply chain management: Strategy, planning, and operation (7th ed.). Pearson Education.

 Ellram, L. M., & Siferd, S. P. (2013). Sustainable supply chains: An introduction. In The Routledge companion to strategic supply chain management (pp. 129–145). Routledge.

 Handfield, R. B., Monczka, R. M., Giunipero, L. C., & Patterson, J. L. (2019). Sourcing and supply chain management (6th ed.). Cengage Learning.

 Heizer, J., Render, B., & Munson, C. (2020). Operations management: Sustainability and supply chain management (13th ed.). Pearson.

 Leuschner, R., Hinterhuber, H. H., & Bätscher, W. (2016). Purchasing and supplier quality management. In The Routledge handbook of transport economics (pp. 273–288). Routledge.

 Monczka, R. M., Handfield, R. B., Giunipero, L. C., & Patterson, J. L. (2019). Purchasing and supply chain management (7th ed.). Cengage Learning.

 Sodhi, M. S., & Tang, C. S. (2012). Managing supply chain risk. Springer Science & Business Media.

 Spedding, L. (2016). A study of good faith in contract law: A comparative analysis. Springer.

 Wisner, J. D., Tan, K. C., & Leong, G. K. (2020). Principles of supply chain management: A balanced approach (5th ed.). Cengage Learning.

 Halldórsson, Á., Kotzab, H., Mikkola, J. H., & Skjøtt-Larsen, T. (2007). Complementary theories to supply chain management. Supply Chain Management: An International Journal, 12(4), 284–296. https://doi.org/10.1108/13598540710759808

 Hines, T. (2004). Supply chain strategies: Customer driven and customer focused. Elsevier.

 World Trade Organization. (2022). Understanding the WTO: Agreement on government procurement. WTO.

 International Organization for Standardization. (2015). ISO 9001: Quality management systems— Requirements (5th ed.). ISO.  Trent, R. J. (2007). Strategic supply management: Creating the next source of competitive advantage. J. Ross Publishing.

 van Weele, A. J. (2018). Purchasing and supply chain management: Analysis, strategy, planning and practice (7th ed.). Cengage Learning.

 Cousins, P., Lamming, R., Lawson, B., & Squire, B. (2008). Strategic supply management: Principles, theories and practice. Pearson Education.