The new efficient technique of imposing the statistical correlation when using the Monte Carlo type simulation (e.g. LHS) is suggested. The technique is robust, efficient and very fast. The method is implemented in the FREET multipurpose software package based on LHS for the reliability analysis of computational problems, Novák et al, (2002, 2003)Pukl et al. (2003). The method has several advantages in comparison with the former techniques: