If you are buying a plane ticket, knowing the pertinent vocabulary will be focused, efficient and satisfactory. The vocabulary your brain wants to learn and anticipate, is the minimum, adequate and limited to the subject in question. No geophysics, no botanical vocabularies would be welcome then!. SPANISH-to-GO! deliberately focuses only on the select conversational vocabulary that will allow your brain the opportunity to internalize every new piece of vocabulary and culture, before moving ahead. Once this foundation is well built, any new addition of words and phrases is welcome, easy, and natural, because now your brain has a clear framework to which such words and phrases can naturally attach.