The information concerning to the criteria can be assessed in various ways. This can be done by assigning a maximum point value for each used criterion. These values are then weighted to their relative importance on the overall project delivery strategy. When a criterion is made up of sub-criteria, the weighed value scores of the sub criteria are added to calculate the total value for the category. To avoid biases, it is recommended that a minimum of three evaluators is required for each scoring activity. Holt et al. (1993) have planned a modified quantitative model for selecting contractors. This model comprises a three-stage process requiring the calculation of what is called P1 scale index to investigate the more general areas surrounding potential bidders. A P2 scale index is calculated for the second stage to assess the contractor further in the light of specific factors. Finally a P3 scale index is calculated to compare the bid prices amongst the invited bidders.