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Harvest blocking is a fundamental decision of timber management. The size, location and timing of harvest blocks directly affects the development and structure of the forest at the current time, but for future time periods as well. In developing automated blocking tools, we have found that obtaining the required adjacency and proximity information to implement these tools properly can be problematic. Part of the problem lies with semantics -- in general, we all know what is meant by adjacency and proximity. Depending on the task at hand (blocking versus scheduling) it takes some forethought about the relationships among stands to avoid adjacency and maximum opening size constraint violations.