Quality Measures for Improving Technology Trees

Figure 1

A problematic technology tree. Rounded rectangles depict technologies. They are of Boolean nature: either one possesses a technology, or not. The dependencies (marked with arrows) are of type OR. The numbers indicate costs in gold nuggets for advancing in the tech tree along the arrows. The costs for obtaining entrance nodes (ENs, the nodes representing the technologies that are initially available for development) are marked inside the corresponding rectangles.