When transaction programs are scheduled as standard (the default), APPC/MVS initializes them for each inbound conversation request and terminates them when they finish processing. With standard scheduling, a transaction program's resources are allocated and deallocated for each inbound conversation request. Standard scheduling provides a clean environment each time the TP is scheduled, and isolates TPs from each other and from subsequent requests for the same transaction program. The standard schedule type provides full security, data integrity, and basic performance for TPs.