Dear Khun Palat,
Reference the trailing email, I see there is some misunderstanding as far as the computation & consideration of Design Growth & Contingency is concerned. It is never proposed to be considered by the Estimation Dept and neither can the estimator be the best person to judge on this.
Therefore, as I have been requesting several times earlier (the attached mails), please ensure all Design Growth & Contingency (Spares, Overage, Wastage etc. whatever) should be included by Engineering before releasing the MTO/ BOQ to the estimator.
Dear Khun Pardorn/ Dr. Lederhose,
For better clarity and understanding by all the persons concerned, kindly generate a written procedure for the MTO development. It should be clearly established as to how the Design Growth & Contingency etc. are to be applied on the MTO.