The Intermediate Reading Series consists of 4 volumes. Each volume has 15 lessons. Altogether there are 60 lessons. Every lesson is divided into 2 parts: Skills, Reading Practice. Skills are designed for learning Chinese grammar, sentence structure, paragraph construction, etc. and each Reading Practice part includes 4 passages. Each passage in Book I. contains about 200 ~ 500 characters. Passages in Book II contain about 400 ~ 500 characters. Passages in Book III and IV contain about 500 characters each.