There are several successful approaches to using the digests to locate relevant cases.
From reading secondary sources or using annotated codes, you might have identified a major case on point. Review the topics and key numbers in that case that case; determine which of them (and there may be more than one) address the specific issue in which you are interested. Find digest that covers the jurisdiction(s) you need; the topics and key numbers are the same throughout the system.
Choose one or more Topics that are likely to address the issue you are researching. Read the scope notes to see whether your issue is covered. Skim the outline to find a Key Number or range of Key Numbers.
For more information see Searching with Topic and Key Numbers [on WestlawNext] (PDF).
Note: The Law Library maintains current subscriptions only for the United States Supreme Court Digest and the West's Washington Digest.