| Correspondence units or workbooks are written for independent distance study by the
course designers or instructors, and tailored to the course and students. They are
generally written in a personal style, as if the writer were speaking directly to a
student (a "tutorial in print"), and are structured so that the student's
reading corresponds to the agreed study schedule for the course (each unit might
correspond to eight hours' work or a week's work, for example). A well-designed unit
contains explicit study objectives, a clear table of contents, a glossary of any new or
technical terms introduced, completed examples, and many in-text activities, such as
exercises and self-assessment and review questions. Students may be encouraged to annotate
the units with their comments and answers to exercises and quizzes, and then compare their
responses with model answers or instructor's comments at the end of the unit.
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