11  Estimated Change in Project Costs and Change in Project Costs.

The parties agree and acknowledge that all methods of determining the Estimated Change in Project Costs and the Agreed Change in Project Costs (whether by the Service Provider pursuant to paragraph 2.1 (Service Provider Stage 1 Response), the Service Provider pursuant to paragraph 9 (Benchmarking Process), by the Independent Technical Adviser pursuant to paragraph 10 (Independent Technical Adviser) or the Service Provider pursuant to paragraph 8 (Competitive Tendering) shall take into account the principles set out in Schedule 22 (Revision of Base Case) and if the all parties shall act reasonably and in good faith in so doing.