The paper considers the debate in contemporary philosophy of science on the concept of non-classical science – its criteria, time of occurrence and time of completion. A comparative analysis of classical and non-classical science is developed, the relationships between them are investigated. Major subsystems of science – natural, social, humanities and mathematics – are taken as a research material.
Keywords: classical/non-classical science, new/old, discontinuity/continuity, subsystems of science, natural sciences, social sciences, humanities, mathematics.