Which of the following is not one of the four basic purchasing steps?

The correct answer is quality control, as it is not considered one of the four fundamental steps in the purchasing process. The basic steps in purchasing typically include requisitioning, which involves identifying the need for a product or service and formally requesting its acquisition; negotiating, which entails discussing terms, prices, and conditions with suppliers to arrive at beneficial agreements; and ordering, which is the actual placement of an order to procure the goods or services identified as necessary.

Quality control, while integral to ensuring that the purchased products meet the required standards and specifications, is more of a subsequent activity after the purchase has been made. It focuses on monitoring and maintaining the quality of goods delivered, but does not fit into the initial phases of the purchasing process where the needs and transactions are formulated and executed. This difference in focus illustrates why quality control does not form part of the core purchasing steps.