answer:Not sure exactly what you mean by "category," but your question is organized by the topics you file it under, in your case "how to","logic" and "category". Yahoo Answers is a little less flexible, with every question just filed under a single category. Either way, there is no magic algorithm that decides where the question goes, it's just part of the data entered by the asker. Ask-public does have an algorithm that decides who to guide the question to, but I don't believe that's what you're asking about. Does that clear things up?