Solution of script N sign = 2 Theories via Instanton Counting

The script N sign = 2 gauge theories in four dimensions were solved to a large extend by the method of Seiberg and Witten which relies on the constraints of special geometry and several natural assumptions. However these constraints are not powerful enough to solve any script N sign = 2 theory and one would like to have a more direct route. We present here such a technique, following [1].