There is a strong argument that we should investigate TEFL tourism in terms of sustainability, and that's something that doesn't appear to be done at the moment. Many governments are turning to this as a method of improving the development in the region, of improving the quality of English that's spoken. But actually, there doesn't really seem to be any measurable outcomes as to whether TEFL tourism is contributing to that or not at the moment. And like I discussed before, in terms of negative impacts, there could potentially be some resentment between the local population and the TEFL tourists-- not only because of differences in salary, but also because of the attitudes of the TEFL tourists. Are they reliable? Do they turn up for work every day? Do they take it seriously? Or is it just a method of making money to extend their travels? If they don't take it seriously-- perhaps they have a lot of sick days, perhaps they quit and just like that and leave them with no teacher. And those sorts of things-- perhaps they're not doing the best job, that they're lazy because teaching actually isn't their primary motivation. Then what are the impacts of that on the learning outcomes?