The objectives of this research were: 1) to study the human resource management systems (HRMS) in Thailand’s state enterprises; 2) to study the impact of the perceptions of HRMS on employee job performance in Thailand’s state enterprises; 3) to test the mediation effect in the relationship between the perceptions of HRMS and employee job performance in Thailand’s state enterprises; 4) To test the moderation effects on relationship levels between the perceptions of HRMS and mediating variables and between mediating variables and employee job ...