Whether you're measuring the force of a hurricane or how much you prefer ice cream to cake, it's easy to see that a scale of one to ten is more precise than ""much more,"" ""very much more"" and ""very, very, very much more""--and that other scales using inches, meters, or Fahrenheit or Celsius degrees as units make it that much easier to communicate about height or temperature. Branley doesn't go beyond this one rock-fundamental concept, but early elementary classes that plan to do so might well start here. It's a natural prelude to his Measure with Metric (1975).