PCB design is no longer a matter of placing tracks to create connections. High speed logic combined with smaller and more complex packaging technologies place new demands on the PCB Designer. It is not possible to satisfy all the requirements of the design by only considering the clearance between tracks, pads and vias. Designs today can also require that you apply specific requirements to individual nets, components or regions of the board as well as considering such issues as crosstalk, reflections and net lengths. Altium Designer's PCB Editor allows you to define design rules that monitor and test for these and other requirements.