During this step, the programmers implement the design by coding application programs, BMS and Job control statements. The system administrator is responsible for updating CICS tables to include the necessary entries for files, transactions, programs, maps, work areas, etc. Each program is tested and debugged, first by itself and then with other programs (unit and system testing) with which it must work. Programs to be run in an online environment must be tested under conditions similar to that in which they will be used. At some point, for example, a program must be initiated by several users simultaneously to see if this creates any unexpected problems.

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