Presented at Interaction South America 2015. "Is this a business or a design decision?" One might think of both as separate fields, given how decisions are made in a daily basis, the business analyst (or equivalent) usually being the one responsible for defining how a company will create value to its clients. As an interaction designer, how can I materialize these decisions in the form of interfaces, navigations or product mechanics? Will I have to compromise on design principles? What is the cost-benefit relation? Can we cocreate ideas with "business people" from scratch? In this talk, I'll show cases where both design and business have merged almost becoming indistinguishable.