Employment-related performance tests have been known since ancient times. In this article, we have demonstrated how functional tests were used in the responsa literature over years, when making decisions on the ability of working people. In contrast to the conservative approach that exists in the responsa literature, according to which the very existence of the eclipse of tremor in the hands leads to the disqualification of a shohet or mohel from continuing his work without taking into account other variables, individual fitness decisions were presented which used functional tests or visited the employee's place of work in order to determine his ability to continue working. The use of functional tests as described in the responsa literature is also of great importance in the world of the occupational doctor's practice in the modern era.