Introductory courses are for learners with zero background in Mandarin (Putonghua). It lays important ground for futher studies. Intro Level A is the first entry book. Important topics, like pinyin, self introduction, shopping will be learned. It covers about 300 essential words, phrases and important structures, word orders. The information is introduced in a conversational context resembling real life. And audio files included. It is best practiced with Intro Level A workbook.