How much in percentage to allocate for technical vs. commercial evaluation for a construction bid. You have four technical evaluation criterion?

Irrespective of the budget we have, we always look for quality product or solution. So, Technical evaluation has to be given at least 80% weightage. Once the vendor is technically viable (they understood our requirements precisely and provided apt solution), then we can get on to the commercial negotiation.

What if we consider for the technical and for the commercial ?