Understandable An indicator must be understandable. You need to know what it is telling you. There are many different types of gas gauges. Some gauges have a lever that moves between 'full' and 'empty' marks. Other gauges use lights to achieve the same effect.
Some gauges show the number of gallons of gasoline left in the tank.
Although different, each gauge is understandable to the driver. Similarly, with the report card, different schools have different ways of reporting academic progress. A through F. Other schools use numbers from 100 to 0. Still other schools use written comments. Like the gas gauge, these different measures all express the student's progress or lack of progress in a way that is understandable to the person reading the report card.