Investigating labor productivity in construction based on the levels of implementation of human resources management practices

Increasing the productivity of human resources is one of the main plans of managers in every organization because human resources are the most important capital of every organization. Human resource productivity means the maximum use of skills and human resources. In this research, six functions of recruitment, job analysis, education, performance evaluation, work relationships, and employee services are considered effective factors in human resource management to increase the productivity of human resources. Also, the two variables of job ability and job motivation are also considered mediating variables. The current research is practical in terms of purpose, in terms of the nature of the research, it is descriptive, in terms of data application method, it is part of survey descriptive methods, and in terms of the research implementation process, it is qualitative. In this research, library studies and questionnaires were used to collect information. The statistical population of the research is all employees of contracting companies with grades one to five, numbering 150 people. In this research, the data were analyzed using the structural equation method with the partial least squares approach and using PLS software. The results of this research show that among the six functions of human resources management, the independent variables of job analysis and employee services have the greatest impact and the independent variable of performance evaluation has the least impact on the mediating variable of job motivation. Also, the two independent variables of recruitment and employment services have the greatest impact and the independent variable of job analysis has the least impact on the mediating variable of job ability. As a result, among the two mediating variables of job ability and job motivation, the variable of individual performance is more dependent on job ability.