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The Application Development Facility (ADF) is an IBM-developed 4GL application package to be used with IMS databases. A programmer is able to define a set of rules using the Application Development Facility, which, when combined with a simple screen printer, could be used to create an IMS DC application. The codes being programmed are more like logical transactions rather than full programs, allowing the smooth transition to DBMS and new computer types that eventually upgraded the entire application set.