Nowadays the different forms of information are used beginning with deterministic information and finishing with fuzzy information. This paper presents a four-level hierarchical classification of information. The first level of hierarchy is deterministic information, the second one - probabilistic information, the third one - uncertain-deterministic and uncertain-probabilistic information, and the fourth level is fuzzy-deterministic and fuzzy-probabilistic information. Each following level has to be considered more general than the previous one. The scheme is very simple, but its applications will be immeasurable. An analogical scheme is described for classifying systems and different objects and phenomena.