Some experts believe that employees are the most important element to create Evolution in the organization, so in most organizations, managers look for to identify the expert staff in different parts of the organization so that they can play a significant role in improving the quality, efficiency and productivity of the organization by teaching) transferring the knowledge and experiences of these people (to other employees. In order to identify qualified employees, it is necessary to evaluate how the work is done in terms of quantity and quality to gain the understanding, knowledge and ability of employees in relation to the performance of tasks. Therefore, in determining the capacity and abilities of employees, it is not enough just to quantitatively evaluate the assigned tasks, it is necessary to refer to the qualitative evaluation by obtaining the opinion of the relevant official in accordance with how to perform the assigned tasks (experimental and tacit knowledge). In most government and public organizations, the tasks assigned to employees are not related to the job description, and also due to their multi-task, it is not possible to identify the skills of each person in each field. In order to determine the capacity and capabilities of employees, it is necessary to obtain a clear definition of the different parts of the work of the data recorded by employees in the operating systems of the organization. Then, by defining the operational model based on data mining, such as: combining quantitative and qualitative scores, eliminating additional data, preparing data and identifying the relationship between data, acceptable results were achieved. In this study (Case study: Bank of Industry and Mines) first using Delphi method, different sections of employees' work based on their activities are identified (categorized into 6 groups), then by collecting data from the system: Traffic control, performance evaluation system (completion of quality performance score of employees by branch heads), banking operations system) BANCO (and by analyzing them, the expert forces of the organization were identified. By reviewing the results and feedback on the identified qualified staff, the level of performance satisfaction in this method was also assessed, which has been highly acceptable.