Specific Guidelines to Manage and Control Variation Orders for DPWH Infrastructrure Contracts. Category: Department OrderSub Category: contracts-contractorsSeries: 2015No: 28File: DO_028_S2015.pdfDate: Monday, March 2, 2015Tags: Specific Guidelines Manage Control Variation Orders Infrastructure Contract PrS 028Bureaus and Services: Procurement Service Read more about Specific Guidelines to Manage and Control Variation Orders for DPWH Infrastructrure Contracts.