Thanks deeply for all these nice viewpoints and fruitful additions. Many heartfelt thanks go to Mr.Morabiti for his nice topics and contributions and I want to add that such theories are indeed useful but the main problem is that we don't know how to apply them in our classrooms or let us say, sincrely, that nonone has ever shown us how to benefit from them( at least as far as I'm concerned). They only provide us with theories and terms but none shows you how to apply them properly