Listening to the Q&A on Rick Steves' radio show, I have several times heard callers ask if there was a "language barrier" in some particular country, say Hungary. I could never help smiling when I heard that. Well yes, there is, and guess what: It's on your side!
What these callers were actually asking of course was "Do people speak English over there?" or "Will I get around with no knowledge of Hungarian?", and it would have been perfectly fine if they had asked just that.
They made it sound though like the people of Hungary were putting up a language barrier for them by not speaking English when they deigned to visit. It never seemed to occur to them that the language barrier was the fact that they themselves didn't speak any Hungarian, or whatever the language of the country they were visiting might be.
I have seen this attitude in Germans and find it disgusting, like in certain Mediterranean places that are frequented by lots of German tourists where they will simply address a waiter in German without so much as an attempt at a "Kalispera" or "Hola". I have overheard American tourists in Munich and Heidelberg directly addressing a store salesperson in English, without so much as an attempt at a "Guten Tag" or "GrĂŒĂ Gott" or whatever. I find this attitude extremely arrogant in any nation and language.
No one will expect tourists to be fluent in their language, but anyone can be expected to at least learn the common greetings and "thank you" in the language of the country they are visiting. Possibly the above mentioned waitress would have been friendly and helpful with her few bits of English had the tourists shown a little bit more effort to at least address her in the local language.
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As far as this study goes, I must admit that I have my doubts about these statistics.
It takes quite a bit of searching, but on their website they themselves admit that these numbers are not representative:
"The test-taking population represented in this index is self-selected and not guaranteed to be representative. Only those who want to learn English or are curious about their English skills will participate in one of these tests."
Selecting participants who already have an interest in the English language is a pretty strong bias. That means the test does not say anything about the size of that part of the population that is not interested in learning English. This, IMO, is a serious flaw in the methodology and in itself makes the study unscientific.
Also, internet access is required for participation, which again excludes a significant number of people.
My guess is that, with these two major biases, less educated people and people without access to modern technology are significantly underrepresented in this study, which IMO makes it pretty much worthless in judging the average English proficiency in any one country.