There are a number of ways of effectively carrying the evaluation and the precise method used may vary depending on the complexity of the Procurement Event, the degree of transparency required and the particular requirements of the Business Sponsor. The discussion in the Process Guide reference is consistent with a Procurement Event which is at the more complex end of the scale and one which requires a high degree of transparency. It represents therefore a superset, if you will, of what may be required in other specific cases.
After the Technical Evaluation Team has completed the Technical Evaluation Report and the Commercial Evaluation Team has completed the Commercial Evaluation Report, and have independently briefed the Procurement Governance Group and Business Sponsor, the two teams should come together to syndicate results and, following the pre-agreed and pre-approved weightings, combine the results into an Overall Assessment Model. The following diagram illustrates the idea.