Annotation

Annotation: The purpose of the work is to study the area of applicability and inapplicability of non-sequential algorithms. The content of the concept of sequence is revealed. Its polysemy and application in programming are shown. The difference between sequential and non-sequential programs is shown. An analogy with deterministic and non-deterministic calculations is given. The pr inciples of operation of sequential programs are described. Situational and subsidiary algorithms are considered as non-sequential algorithms. The example of the IF-THEN-ELSE construct shows the difference in its implementation in sequential, situational a nd subsidiary programs. The article shows that the use of non-sequential algorithms and methods allows solving a greater number of problems that sequential programs do not solve. The article gives the criteria for applicability of situational and subsidiar y algorithms