A critical issue for using information systems is the need for assessing what people have learned and for using that information to provide substantive additional instruction. The creation of electronic training material is relatively easy; however, creating systems that truly adapt to an individual student is more difficult. For example, textbooks can be scanned to create electronic textbooks for students to read, but these electronic textbooks may be no better than the paper version if they do not assess what the student knows or present only material the student needs.