Another reason Mandarin Chinese can be so challenging is there is no transfer between the written alphabets. Many educators help learners by using pinyin. Pinyin is a phonetic system for transcribing Chinese characters into the Latin alphabet. They use letters with symbols to indicate the tones.
What I am learning is second language educators teaching Chinese have to develop an extremely wide repetoire of second language learning strategies. It can take approximately five times as long for a native English speaker to learn Mandarin Chinese. To keep things fresh and engaging for beginning and early intermediate learners the teacher must design lessons using multiple strategies to provide comprehensible input in a variety of contexts in order to learn even the most basic vocabulary. It is believed that second language learners require up to 80 times hearing, speaking, viewing and/or interacting with or using a given word before acquisition takes place.
It's been fascinating to begin to understand and appreciate how Mandarin Chinese learners begin to acquire the language and the need to support our second language teachers with extensive training on language acquisition strategies and pedagogy.
Be sure to check out the support resources for world language on the San Diego County Office of Education website. Also visit WestEd to learn more about current research on second language acquisition.