6.32 While all the acceptable bids will meet the minimum criteria, there may be significant differences in some of the qualitative factors in the proposals. The Business Case Guide contains further guidance on the use of weighting and scoring techniques to compare. In general it will be appropriate to re-use or develop the weighting and scoring matrix that has been used in the option appraisal conducted at the Outline Business Case stage. There may be a need to add new criteria, or to divide the existing criteria into more detailed and specific sub-criteria to aid a more careful and rigorous evaluation of the differences between proposals. This should be completed prior to issue of the OJEU as the OJEU will provide an indication of how proposals will be evaluated.