When I moved to the US, I learned English reading children books to my kids. After that experience, I came to understand that most traditional methods of teaching a foreign language are not as good as they claim to be. Sure, they do teach a person to ask for a bill at the restaurant. But do they teach you how to behave if a Brazilian invites you to dinner? I believe in teaching what the student wants to learn. If you are an executive going to work in Brazil, you will need to know the Brazili.