I saw this video earlier today (The most important part is from 8.00 to 9.00), explaining what the "Pimsleur approach" is. It got me interested, because they claim it's the fastest method of learning the basics of a new language. Has there ever been research trying to find the best method of learning a language? Is this approach comparable to the "best method"?
To place it in context, I want to learn Finnish, and I'm first looking for a good learning method.