Determining the universal factors that affect the assessment of job performance, that is the elements constituting a job is a very complex action and it represents the first step towards the unique assessment of job performance in an organization. In order to create a unique solution, it has been suggested that the criteria should consist of the elements which have a universal character and provide the evaluation of all tasks in the Serbian Armed Forces. Performance assessment elements are defined in such a way that they describe each of the defined criteria in more detail and represent an integral part. It is possible to nominally determine each of the criteria within job, and thus evaluate each task in the Serbian Armed Forces by assigning a certain value to each of the elements. The essence of the proposed model is that it can be applied to the work of all employees, which also allows determining the relative value of each job in the Serbian Armed Forces or its individual part.