ABSTRACT
The article deals with a simple way to allocate reliability and maintainability requirements which enables us to specify single system parts requirements preliminarily in early phases of system development and design. The method might be used for the system made of subsystems arranged into a serial structure when a failure of any subsystem leads to a whole system fault. For the whole system, however, there are no separately set requirements for its reliability and maintainability level, but overall it is necessary to achieve a certain level of availability. The method is based on a rational presumption that the requirements for a single subsystems reliability and maintainability level should be determined so that the subsystems in which a higher failure occurrence might be expected could have stricter maintainability level requirements than the systems with a higher reliability level. The suggested method is illustrated through a practical example.
