Ways for evaluating system faults, impacts and design are suggested from practical experience, testing to planning in many disciplines and international field cases. Methods of training, testing, lifecycle costing, unit pricing, benefit for resources, comparing scenarios, disaster mitigation, regulations, people responses, matrix management, business planning, ...are outlined then applied in specific cases. Cases include the failure of exhaust axial fan blades, of a mall central plant chiller,... the impacts of Mekong Delta development, saving mangroves about SE Asia to control coastal...