A well designed product satisfies performance requirements and optimizes between reliability, producibility, supportability and cost criteria. In the design of electronics, these design criteria originate from a variety of disciplines. Electrical criteria include meeting signal distribution, power distribution, board I/O, and grounding rules, reducing crosstalk, and minimizing routing track lengths to meet speed and transmission line specifications. Environmental criteria include meeting environmental derating limits. Mechanical criteria involve designing for durability under vibrational and thermalmechanical loading. Manufacturing criteria include meeting geometric constraints for quality control, and providing acceptable assembly conditions.