In some systems there is a Perspex slider which can be in one of three positions relating to the colours clear, red or yellow. The room type is shown in the centre of each slot, and is colour-coded over the room numbers on the left. This way, the room type can be identified even when a rack slip is in place. Arrows are used to show communicating rooms. The centre section can also be used to show the room rate and the location of each room (Figure 6.6). The maximum information about the room is presented to the receptionist with this method.