ABSTRACT
One of the most important concepts that I want to get across is that when a process is changed, it will get worse before it will get better. This is regardless of how justified the reason for the change is. It does not matter if the process is in control or out of control. As discussed in earlier chapters, it is adding variance to the process. Making a change or adding a variable or more than one variable causes problems in the process. An in-control process can go out of control when a change is made. If the process is out of control, this means there is excessive variation and there is an assignable cause or causes. Action should be taken to bring the process into statistical control as shown on the control charts. Only make changes when there is problem variation which will be described in this chapter.
