Safari Books Online is a digital library providing on-demand subscription access to thousands of learning resources.
Generally you want each data value to be displayed in only one way. There might be some circumstances, however, in which you want a value to be counted in several ways. For example, you might want to see a percentage score in bands of ten, but also with a Fail, Pass, or Distinction category. Multilabel formats enable you to accomplish this type of classification.
In this example, we categorize ages from the CLASS data set in two different ways—first by a simple range, and then by whether the student qualifies as a teenager.