Volleyball theory is based on reality of volleyball. Concepts in the theory of volleyball are most commonly associated with specific facts about the phenomena from volleyball practice. Definitions of terms in volleyball have a significant role in the interpretation of the theory of volleyball.
Defining concepts of volleyball form the knowledge of behavior and experience of volleyball players. Modes of interpretation volleyball theory are important for the development of the theory of volleyball for the following reasons: the interpretation has revealing function for new knowledge in volleyball; they lead to the discovery of more general knowledge that connect theory of volleyball with the more general theory of sports; They can provide new volleyball skills and experience; constantly linking the theoretical and practical facts; they contribute to change the attitudes of rules and theorems.
Thus the interpretation of the theory can explain the volleyball players movement and its importance as a distinct field of study of human movement, which contribute to health and life. Volleyball theorists want to expose all the knowledge in the form of a theory that is equally well connected with the practice in volleyball, sports theory and the theory and practice of scientific disciplines that contribute to the development of volleyball.
Therefore, the theory of volleyball can be represented as a closed and formed system of knowledge. But also, can be represented as an open system because it is constantly changing under the influence of knowledge in other areas. So in theory of volleyball dominates the openness of the system because it is constantly evolving and improving.