Local Road Management Manual 180 part of the Works is completed as certified by the Taking-Over Certificate or the Certificate of Completion; k. Variation. This means any change in the Works as instructed or approved by the Engineer; l. Progress Payment. This is the valuation of the works done by the contractor at the end of each period as specified in the contract; and m. Retention Money. This is the accumulated amounts of money retained by the Employer in every progress payment. n. Warranty Period. This is the period were the contractor shall warrant the works completed and the contractor shall issue a warranty security issued on behalf of the end user and stakeholder after the defects liability period. The amount of which is equivalent to 10% of the contract amount. 3.2 Pre-construction Phase Following the award of the contract for construction, the Employer, the Contractor and the Engineer shall schedule and attend the Pre- Construction Meeting. The purpose of the Pre-Construction meeting is to discuss the specific requirements of the Contract and how they relate to the daily operation of the construction project. The Engineer should prepare an agenda and conduct meeting prior to Contractor’s mobilization. Minutes of the meetings should be taken and distributed to all parties. The agenda described in the section on Pre-Construction Conference under Construction Supervision shall be followed. In administering contracts, the Resident Engineer would function as the assessor and the certifier. The Resident Engineer would assess the contractor’s progress payments, claims, variations and quality of the works performed; in addition, the Resident Engineer must also be keen on maintaining project site documentation. The following are the general guidance for managing the contract during the construction phase: a. Contract Documentation. The implementing agency through the Resident Engineer shall provide copy of contract documents to all involved parties.. The following documents shall be