Course book is set of documents and exercises that are structured into lessons.

Lesson is a part of a course book. One course book consists of one or many lessons. Lesson comprises of reading materials and exercises.

 

Course book is divided in to lessons. Lesson can contain both reading documents and exercises. If the reading material for the lesson is contained in one document, this document has to set as the lesson’s contents. If the lesson contents are in two or more documents, the lesson must be structured into units.

 

Each unit can contain one or more documents. In case there is one document per unit, this document will be defined as the unit contents, in case of multiple documents per unit, the documents will be called unit materials.