This work is a comprehensive textbook for engineered timber construction and deepens the understanding of the fundamentals of the design rules of Eurocode 5. It builds on the first edition of the STEP series, the books from the Structural Timber Education Programme, which were developed in 1995 by around 50 authors from 14 European countries. The present book is an updated and expanded edition aimed at students, structural engineers, and other practitioners in timber construction.