Abstract
We suggest a new design methodology for a multi-objective trade-off design and a risk management, called Total Design Management (TDM). TDM has two important concepts: "Set Based Design (SBD)" and "Model based Risk management (MBR)". In SBD, designers firstly calculate the total set of design solutions and then narrow down the solutions complying with the design requirements or constraints conditions by a filtering method. SBD is very simple, transparent and practical process. In MBR, designers manage a design risk based on designers' un-confidence of the mathematical models which they make or calculate. SBR and MBR are integrated with the mathematical models.
