Each headnote of a case published by Thomson Reuters (West) is assigned at least one what?

Each headnote of a case published by Thomson Reuters (West) is assigned at least one Topic and Key Number to facilitate legal research. This system categorizes case law into specific legal topics and subtopics, allowing legal researchers to easily locate relevant cases based on the issues they are exploring.

The Topic identifies the area of law being discussed, while the Key Number provides a more granular classification within that topic. This structure is highly beneficial for anyone conducting legal research, as it helps streamline the process of finding pertinent case law that aligns with particular legal questions or topics of interest.

In contrast, the other options do not reflect the standard system used by Thomson Reuters. Summary and Citation pertain to case summaries and legal citations but do not encapsulate the classification system used for headnotes. Author and Date do not pertain to the content of the headnote itself, and Unique Identifier and Topic do not accurately represent the established terminology used by Thomson Reuters.