Abstract: A method for providing varying amounts of simulated latencies for a mainframe is disclosed. The method includes modifying routing to pass through a simulated latency injector system; setting an initial latency amount for the target mainframe; when the mainframe application is determined to be unstable, modifying the OSA routing to bypass the simulated latency injector system; when the mainframe application is determined to be stable in the first monitoring, initiating a planned latency injection schedule for injecting latencies in differing amounts until a target latency amount is reached; performing monitoring for the stability of the mainframe application; modifying an injected latency amount back to the initial latency amount when the mainframe application is determined to be unstable in the monitoring; and applying another latency amount specified in the planned latency injection schedule when the mainframe application is determined to be stable.