This paper presents a summary of the most recent research-oriented studies with a focus on two of the most important categorizations of Form-Focused Instruction (FFI): isolated versus integrated. The theoretical differences between the two different types of FFI are provided and a brief summary of the most recent studies is reported. The paper finds that isolated versus integrated instruction is a necessary technique and needs to be applied to the teaching process at the appropriate time. In general, the findings indicate that the tendency toward implicit learning of grammar through using communicative forms of the language is improving and the final outcome of this approach shows improvement and progress in the learners' production and language development.