I believe the GSM and GSR methods deserve their own thread. I want to make a review of this method, though I'm only halfway through the fluency 2 phase in Russian. It's plain wonderful and I'm not exaggerating one bit. For measly 70 dollars, you'll get 3000 thousand sentences in English and the target language (in my case Russian). It's divided into 3 pdf files, one for each fluency phase, each having an introduction about the methodology and the target language itself. Then you have a 20 GMS mp3 tracks per unit, subdivided in A, B, C, where the A files contain the pronunciation of the English sentence and of the target language twice, B is English - space -target language and the C is target language only. If you're not ready for this pace, then you can slow down by using the GSR method, which means that those 1000 sentences are broken down to 104 files, repeating itself just like Pimsleur is. Unlike Pimsleur the files don't have any unnecessary ballast i.e. "Imagine yourself in a Parisian café. You want to talk to a French lady and...", it's not as tedious and boring, because you can choose your own pace, even though you should do at least one GSR file a day.
70 dollars is perfectly justified by the amount of content. It's more than Pimsleur offers for 450 dollars (1,2,3,4). It surpasses Pimsleur in one more aspect. Pimsleur may have 4 phases for Mandarin or Italian, but only gives us 1/3 of a phase for Danish or Armenian. Glossika offers 3000 thousand sentences for each language, because it uses the same sentences in every language pair you choose (you can learn Italian through Swedish and so on).
I started with the GSR files, but the Russian language is at least 40% similar to Czech in terms of vocabulary and grammar, so I'm doing 50 sentences a day now with reviewing the previous sentences . I know I couldn't do this with say Japanese and that's what I love about the course the most. You can use it however you like it, skip at any time, which is pretty uncommon in ordinary excersise books. The GSR may be slow (10 months or 5 months doing 2 tracks a day), but your pronunciation will be much better if you take this path. Mike himself says, that you shouldn't bet everything on one card, so I'm using several other resources in order to support this method, but overall I'm more than satisfied by it.
Nothing is perfect, so it's natural there are some mistakes in the books, but the only one I can think of now is that shoes are translated as туфли (pumps) which could lead to a misunderstanding, especially if I told some Valuev-like Russian, that his туфли look stunning.
This is not an advertisement, but if you want to find out more about this method, I'm posting a link below.
http://www.glossika.com/
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