In school today pupils come in contact with all kinds of reading books. Education of Swedish reading development sometimes contain reading books organized at different levels of difficulty, with different amount of text. The purpose of the different difficulty levels is to give the less skilled readers an easier book and stronger readers a more difficult book. The purpose with this study is to find out if the book which is classified as more difficult, in reality is the most difficult and if the book which is considered to be easier really is. To find answers to these questions I will examine previous researcher’s theories on difficulty levels in reading books. This is tested in the analytical part by counting the proportion of nouns, compound nouns, main clauses and sub-clauses. The texts are analyzed using LIX-and-OVIX to find out the level of difficulty. The books examined in this study are two reading books aimed at pupils in second year of elementary school.