Teacher Created Resources is an educational publishing company founded by Mary Dupuy Smith, a classroom teacher. The concept behind this successful line is that they''re aware first-hand about teaching. All the products are "created by teachers for teachers and parents.". High-interest, nonfiction articles help students learn about science topics while developing skills in reading comprehension. Each story is followed by questions that cover main idea, detail, vocabulary, and critical reasoning. The format is similar to that of standardized test, so as students progress through the books units, they are preparing for success in testing. Each unit provides introductory key words, a high-interest story, and 5 test questions. Set includes one book from each level, grades 1-6 (6 books total). 1st - 6th Grades.