My tour through Finnish e-textbook companies continues this week with eOppi Ltd . My guide last Tuesday was the company’s development manager Johannes Pernaa. eOppi, whose name comes from the Finnish word for “lesson,” was founded in 2011 by Simo Veistola, an experienced textbook writer. The company has so far published around 70 e-books and other materials, and works with some 120 textbook writers. The materials are published on the Pedanet and OnEdu platforms. While these are easy enough for an author to use, eOppi prefers to work through editors to achieve consistent quality. The materials are free for teachers; schools pay 5 euros per student for a two-year license. The authors can choose to be paid either on a fixed percentage — which is higher than that from hard-copy publishers — or on a lower percentage that rises after a certain sales volume. The eOppi books seem to compete well with traditional books and add value with their media elements. Their American Geography offers a portfolio for students to collect their own materials, the ePhysics includes several videos of student experiments, and the Music Book even offers sound files for the always-crucial ukulele tuning .