So far we received 3 solutions for our Apr-2018 Challenge “Up-Selling Rules”: DT5GL,  Corticon, and OpenRules. While the decision model is simple, it contains two decision tables that should be executed in a certain order: first define a customer profile and only then offer new products. See how different solutions define this order (automatically or with a hint from humans). Our readers expect to see more solutions using other popular BR&DM tools.