The legislative changes in matters of collective labor relations that took place in the two years since the previous edition, and the production of abundant case law material during this period, made the new edition necessary. And in this new edition, the same objective as in previous editions is maintained: the presentation in an understandable, systematic manner, without unnecessary theoretical analyses, of the main manifestations of collective labor relations, such as trade union freedoms, the conclusion of collective labor agreements, and the right to strike.