Answer: Pilot conversion
Explanation: Pilot conversion is the method in which any new system is exposed or made available to small cluster of people who check and evaluate the system.
It is known as the software migration or hardware migration where the trials are made. Actual response are obtained from the group of those user so that the system can be introduced to all users.
According to the mentioned situation in question , Mother Goose Computing Inc. is using pilot conversion method for the updated system by putting it to module by module trial.