Given an extensive set of gross design parameters and a specific mission payload (weapons system configuration), the math model provides the designer a means to balance a ship in six aspects: weight, propulsion power, electrical power, volume, area, and transverse intact stability. The model also incorporates a weight-based cost model to calculate the initial acquisition cost and life cycle cost of a ship class. The sum of these two costs defines a program's total ownership cost (TOC). Figure 3 shows the basic iterative process followed to achieve design convergence.