Plan, Do, Study, ACT

In the ACT stage of PDSA, if the result was not achieved, examine the interventions and adjust or change them using knowledge obtained from the Study phase of PDSA. If the interventions were successful and the expected result was achieved, then the client incorporates the new strategy or procedure into his/her practice. The question then becomes, “What is the next steps in continuously improving the clients practice?”
Source: http://www.rootcauseanalyst.com/