Interchange has been used by more than 50 million people all over the world. Throughout its several editions, teachers have consistently reported that it works. Their students learn English well when they study with Interchange.
This kind of anecdotal evidence is interesting in its own right, but data tell a better story. This paper reports on two independent studies on how well students learn English when they study with Interchange. In each case, the results indicate that teachers are right. Interchange works.
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