The document discusses the bilingual teaching method, which uses both the mother tongue and target language in teaching. It was developed by C.J Dodson in 1967. The method works by using similarities and differences between the two languages to help students understand words and sentences in the target language. It has advantages like saving teacher time and being less costly. However, it also has disadvantages, such as not being suitable for multi-lingual groups and potentially causing confusion or defective pronunciation when over-relying on the mother tongue.