Leonid Grinin and Andrey Korotayev consider the value of periodization for a deeper understanding of the course of Big History and its specific phases. They analyze features of the periodization procedure of any history and Big History in particular as well as methodological rules of periodization. They consider why it is legitimate to have not one, but many periodizations, and give examples of various periodization bases, as well as possible periodizations of Big History. They also discuss important approaches for procedure of periodization and choosing of criteria for it, explain different types of periodizations, as well as their positive and negative aspects.