The problem of human resource management is becoming more and more urgent every year, since highly qualified personnel, a well-organized labor process ultimately directly affect the competitiveness of products, their low cost and high quality. The proper use of human resources is one of the factors determining the effectiveness of an organization. But, before using it, you need to properly evaluate it. The aim of this work is to study the theoretical principles and develop practical recommendations for improving the personnel assessment system for the oil and gas industry using the example of Bashneft-Retail. An annual mass assessment of personnel will be conducted to assess the effectiveness and value of the work of the organization’s employees. The bonus component and promotion of the employee’s career ladder will depend on the result of the assessment. It will improve the efficiency and effectiveness of the employee’s work, will give an impetus to his development and unlocking potential. As a result of the annual mass assessment of employees, the organization can obtain objective data on the available human resources, and will be able to build a clear and focused training and development system individually for each employee. Each employee will be able to get feedback and see the prospects for their further development, while significantly increasing their motivation. The introduction of the proposed model for improving the personnel performance evaluation system increases the interest of employees in the results of their work and the effectiveness of the organization as a whole. This article analyzes the effectiveness of the annual mass assessment of personnel, the mechanism for its implementation, as well as the practical use and analysis of the expected effect after applying the proposed procedure. A theoretical analysis was carried out, the rationale for the use of the annual mass assessment of personnel and suggestions for its improvement in relation to the oil and gas industry. It analyzes the theoretical foundations of personnel assessment and the study of its key methods, as well as the existing methods for the effectiveness of employees of Bashneft.