How to write Menu Driven CICS programs

You can develop CICS programs, especially menus in the way mentioned below. Any menu driven program should have 3 layers of logic:

Presentation Logic ==> 3270 Terminals
Business Logic ==> COBOL programs
Data Logic ==> Data bases IMS DB/DB2

3 Commands that you need for CICS Menu programs logic

EXEC CICS Send command to send data to 3270 terminal
EXEC CICS Receive command to receive data from 3270 terminal
EXEC CICS Return command to exit from CICS program

The communication can happen in CICS through DFHCOMMAREA and CHANNEL

Link and XCTL to call sub programs

EXEC CICS LINK (CICS to CICS, can be remote)
EXEC CICS XCTL (CICS to CICS)

Sample Logic how to handle Menus:

PROCEDURE DIVISION
 EVALUATE TRUE
        WHEN EIBCALEN = 0
                Send Initial MAP
        WHEN EIBAID = DFHENTER
                Process Screen Data
       WHEN EIBAID = DFHPF3 or DFHPF12
                 Exit Program
      WHEN OTHER
             Invalid key
 END-EVALUATE