THIS PAPER IS ABOUT THE USE OF THE STATISTICAL PROCESS CONTROL (SPC) TO DETECT PROBLEMS GENERATED BY THE VARIABILITY INSIDE AUTOMATIC PROCESS CONTROL (APC). THIS PAPER TRIES TO FIND A SUCCESSFUL TOOL REGARDING TO DETECT VALUES OUT OF CONTROL IN AUTOMATIC SYSTEM. THIS KIND OF TOOL AFFORD EVALUATED THE CONTROL STRATEGY AND WILL BE USEFUL FOR THE DECISION MAKERS. STATISTICAL PROCESS CONTROL, MONITORING NO ONLY THE QUALITY VARIABLES BUT ALSO, VARIABLES IN THE AUTOMATIC PROCESSES THAT ARE CONTROLLING THE QUALITY. IN ORDER TO TEST THIS TOOL, IT WILL BE TESTED CHECKING THE STATUS OF MOISTURE CONTROL IN A MEDIUM DENSITY FIBERBOARD (MDF) LINE, THIS PROCESS, IS ONE OF THE MOST IMPORTANT IN THIS TYPE OF INDUSTRY. FURTHERMORE, THIS USEFUL STATISTICAL TOOL COULD BE USE TO EVALUATED THE PERFORMANCE OF ANY PROCESS INSIDE OF AN ORGANIZATION TO HELP IN THE IMPROVEMENT CYCLES.