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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Open textbooks are flexible in ways that traditional textbooks are not, which gives instructors more freedom to use them in the way that best meets their instructional needs. One common frustration with traditional textbooks is the frequency of new editions, which force the instructor to modify the curriculum to the new book. Any open textbook can be used indefinitely, so instructors need only change editions when they think it is necessary. Many open textbooks are licensed to allow modification. This means that instructors can add, remove or alter the content to better fit a course''s needs. Furthermore, the cost of textbooks can in some cases contribute to the quality of instruction when students are not able to purchase required materials.