Which of the following methods of contracting is not considered streamlined?

The correct answer highlights that purchasing against the GSA federal supply schedule is generally viewed as a streamlined method of contracting. This approach allows agencies to procure a variety of goods and services at pre-negotiated prices, making the purchasing process quicker and more efficient.

When considering the options, streamlined methods are typically characterized by less red tape and faster processes. The use of simplified acquisition procedures also falls into this category, as it allows agencies to buy goods and services without needing extensive processes, thus facilitating a quicker contracting method.

Competitive bidding for large contracts, however, involves a more complex and detailed process that is not streamlined. This method requires extensive documentation, solicitation of offers, and a longer evaluation period, making the overall process more cumbersome and time-consuming.

Thus, the emphasis on the fact that buys against the GSA federal supply schedule are indeed streamlined purchasing methods clarifies that it is not the correct choice in the context of identifying methods that are not streamlined.