Why Customers Really Don't Know Better
There are some professions within the typical organization where the internal customers feel that they know better and can do a better job than those that are truly responsible. HR and Marketing are a couple of examples. But I think the purchasing function is the best example, where customers routinely try to circumvent purchasing. I don't blame them—they purchase goods and services in their personal lives all of the time, so I can see why customers think they're qualified to purchase goods and services in the workplace.
As a purchasing professional, one of your responsibilities is to educate your customers on the value of the services that you provide. To that end, here's a list as to why purchasing should be left to the professionals.
Many thanks to Mark Dolecki, Acquisitions Specialist, Exxon Mobil Global Services Company for this list—and my apologies for my adaptation.
As a purchasing professional, one of your responsibilities is to educate your customers on the value of the services that you provide. To that end, here's a list as to why purchasing should be left to the professionals.
- Purchasing professionals have specialized training that customers don't have, such as competitive bidding, price and terms negotiations, and dispute resolution.
- Purchasing professionals develop, train on, and maintain a reasoned purchasing process that protects their employers from risk and liability—at the same time ensuring that vendors are treated fairly and ethically.
- Purchasing professionals have specialized knowledge related to contracting and contract terms such as representations and warranties, indemnification, limitations of liability, and governing law.
- Purchasing professionals maintain a network of functional specialists to assist in the purchasing role (e.g, audit, tax, law, controllers, treasurers), that the customer doesn't have or doesn't use often enough to maintain.
- Separation of duties provides control over collusion between customer and vendor (the typical "triad of separation" is to segregate requisitioner/receiver, from buyer, from payment.)
- Purchasing professionals can wear the "black hat" and be the "bad guy" during negotiations to keep the customer's relationship with the vendor "clean."
- Purchasing professionals aren't "too close to the purchase" such that they can remain impartiality and objectiveness to ensure the process isn't compromised by emotion, subjectivity, or unnecessary urgency.
- The purchasing department maintains a centralized contract repository to manage contracts, including terminations and expirations—and is also responsible for procurement-related record retention.
- The purchasing department develops and maintains centralized vendor processes, such as vendor categorization and rationalization.
- The purchasing department develops, maintains, and enforces an organization-wide purchasing policy.
- The purchasing department has greater visibility to vendor relationships (e.g., the volume of spend) and manages those relationships to better advantage the business as a whole.
- The purchasing department maintains and operates purchasing-related systems, such as a vendor master file and PO generation.
Many thanks to Mark Dolecki, Acquisitions Specialist, Exxon Mobil Global Services Company for this list—and my apologies for my adaptation.

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