Where should an agency look for guidance when revising its document retention schedule?

The most appropriate source for guidance when revising an agency's document retention schedule is legal or statutory requirements. These requirements provide the framework that dictates how long specific types of records need to be retained and when they can be disposed of. Adhering to these legal mandates is crucial for compliance with laws and regulations that govern public records.

Legal and statutory guidelines often detail minimum retention periods and provide clarity on the types of documents that must be kept. This ensures that the agency protects itself against legal risks, maintains transparency, and fulfills governmental responsibilities. By relying on established legal standards, the agency can ensure that its document retention practices not only meet regulatory requirements but also support sound governance.

The other options, while they might offer relevant information regarding contracts or ethical practices, do not specifically address document retention needs as comprehensively as legal or statutory requirements. The Federal Acquisition Requirements focus more on procurement processes, the Uniform Commercial Code pertains to commercial transactions, and Common Law typically involves case law principles that may not directly inform document retention policies.