What is one condition under the FAR that allows contracting without full and open competition?

Under the Federal Acquisition Regulation (FAR), one condition that allows contracting without full and open competition is when there is an unusual and compelling urgency. This provision enables contracting officers to make quick decisions in situations where waiting for a competitive process would severely hinder the government's ability to fulfill an urgent need.

When urgency is present, the typical requirement for wide competition can be bypassed to expedite the procurement process, allowing for immediate action to meet critical needs. This is particularly relevant in scenarios such as national security emergencies, natural disasters, or other situations where timely action is crucial to prevent harm or loss.

The other conditions presented do not align with the FAR's exceptions for limiting competition in the same way. For instance, all suppliers being unavailable could imply a need to reassess the market rather than justifying urgent contracting. A preferred supplier requirement doesn't inherently justify bypassing competition unless there are specific circumstances that warrant it. Lastly, a single source market situation would usually require certain validation processes, but it does not always equate to the urgency that justifies such an exception. Hence, the condition of unusual and compelling urgency stands out as a specific scenario in which full competition can be limited under the FAR.