After many customer requests and much work from your well$-$trained chefs, you added a line of gourmet burgers to your menu. When the burgers fail to sell, customer feedback tells you that prices are too high. Your team brainstorms ways to cut costs, you choose the best ones, and rerelease the gourmet burger line. Sales have improved, but you continue to watch numbers carefully over the next few months. You have just completed which stage of the problem$-$solving cycle?