It's totally important. Theory and Practice are two separate things. By studying practice, we can create theory. I work in education under a tender process. The tender was written (by accountants) and in theory, they have written good theory, but in practice, it is impossible to achieve. They needed to understand practice to make the theory possible to achieve.
Thank you very much GRAMARYE. Many teachers have been doing many things in the classroom but not really looking into the effects of their actions. I hope many teachers would have to venture into research as to relate how practice impacts on students