Michael Long proposed the concept of focus on form in 1998, which involves drawing students' attention to linguistic elements like vocabulary and grammar within a communicative language teaching approach. Long argued that implicit learning alone is not sufficient for students to master a second language, and that some degree of explicit instruction on language forms is needed. He hypothesized that a systematic focus on form would lead to faster learning and higher proficiency outcomes compared to no focus on form. Input enhancement techniques like highlighting text or manipulating sounds can help draw students' attention to target language forms. Input flooding also focuses on forms by providing multiple examples of a target structure. Comprehensible output production forces students to process language syntactically in order to produce it.