Rainbow Chart Use
Rainbow charts allow teams to quickly see which values are within standard procedures and which processes are outside or at unacceptable levels. If most values fall within the standard (green) zone, then the procedure is generally within control. And, the closer that these values are together, the more accurate the processes are.
If, however, most processes are within the yellow or red zone, then the procedure may be out of control. Standards are no longer being followed, and action must be taken.
Having these charts provides teams with early warning signs that their procedures are not working. While work can still proceed as normal if the values are in the yellow zone, this will let project managers know that one of the tasks or procedures needs to be reanalyzed or changed.
Production, however, should stop completely if more than one or two values are in the red zone. This will indicate the entire process is out of the control.