In this paper we study and analyze a set of Human Resource Management (HRM) techniques and understanding of their relationship to human productivity. We have classified the set of HRM techniques for the firm sizes which are small, medium, and big sized firms. This segregation was done on the basis of the number of employees working in the firm. First, by theoretically analyzing the HRM techniques, it was observed that HRM techniques and productivity are highly correlated, and also by theoretical study only we select the most prominent set of HRM techniques, then out of those HRM techniques top three techniques for each of the firm sizes was statistically estimated by performing TOPSIS analysis which is a Multi-Criteria Decision Making(MCDM) tool. The results are tabulated for the set of top three HRM techniques for each of the firm size.