It is necessary to change into cleanroom garments before entering a cleanroom. The method of entry and the procedures that must be followed are often cleanroom specific and are dependent on the level of contamination control that is to be maintained in the cleanroom. It is common to find that the change area is divided into three zones, or areas. These zones are pre-change zone, changing zone, and cleanroom entrance. Personnel move through the zones carrying out the changing procedure as outlined by the individual cleanroom protocol.