I'm a Trinity graduate myself and think that the Trinoty course itself is superior but CELTA is more widely known.
me too - but that doesn't stop celta grads thinking theirs is the best ;-)
But it's not well-known here is it? More of an Asian course.
good question - they have at least 8 centres in Europe pumping out grads every month and have been doing so for a good few years now. they also have a different approach to conducting 'business' than the other 2 major providers which has helped them build a solid brand quickly. they are, and will continue to be, major players
the ceo is American and the company as teflintl targeted Americans to begin with - hence the popularity of their Asian centre locations
What is callan?
as seanus says, callan is a teaching method. callan as a brand has done phenomenally well in the polish market... for a number of reasons. avalon is the latest method to appear - produced by ex-callan teachers with an updated set of materials but not much else - they will be aggressively marketing in Poland and in fact have a training sessions for new avalon schools in Warsaw tomorrow
the great thing about these direct methodologies for potential teachers is that you probably wont be asked for any sort of teaching qualification - you will be trained up in the method and then be good to go