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In computer science, a core concern is one of the main concerns a program is written for. The main coding of the application is to satisfy the core concerns, such as doing the tasks as visualized. Other coding which is to document changes, maintain histories and other non-direct actions supportive of the core tasks are not core concerns.
If writing an application for Medical Records, the bookkeeping and indexing of such records is a core concern, while logging a history of changes to the record database or user database, or an authentication system, would be cross-cutting concerns since they touch more parts of the program.