The discussion of nature of the psychological law and interrelation between psychological science and practice allows raising the question about the role of schemes and ideal objects in psychology. The notion of «scheme» and «ideal object» are characterized. Two cases are analyzed. The conclusion is made that schemes and ideal objects are created in both psychological science and psychological practice in accordance with each other, but logic and direction of thought is different for the science and practice. Three criteria (external, internal and evolutionary) of validity of psychological theories and difference between academic and practically-oriented psychological theories are examined.