The material from which the part is created has a decisive influence on the complexity and laboriousness assembly. Parts are still mostly delivered to assembly in disordered, chaotic state. The first theoretical work was focused on development of shape classifiers and sample solutions of automated orientation appropriate shape groups. Some works have appeared attempts for classification of components according the symmetrical. The most important assembly property of solid components from view of orientation is degree of symmetry. In this paper the developed methodology for calculating the degree of complexity of parts orientation in the case of parts orientation in vibratory tray.