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IB expanded its reach beyond just English and French speakers for the first time
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Starting in 2004, students could be offered a wider arrange of courses. This is extremely beneficial to smaller schools who previously were unable to offer a full allotment of courses
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The pace of schools adopting the IB curriculum has been expanding at an accelerated rate
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As Mandarin is the most frequently spoken language in the world, it seems likely that the language would be added. However, the question will be adoption. I've been teaching in China / Hong Kong for 10 years now and I know the Chinese equate the education they provide as national security. Taiwan would be sure to adopt it but if many schools in mainland China started to adopt a curriculum which is developed and controlled overseas, they could block it.
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Massive online courses, like Coursera and Khan Academy are becoming more and more popular. I could see the IB program offering lessons to anyone, in an effort to make the world a better place. I'm guessing it will be free to take the lessons but there will be a fee if students are able to take a test and get a certificate.
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The growth rate is increasing and the only question is when the 10,000 threshold will be reached.