Types of D (Data, evidence of your argument 2. Statistics For example: According to China daily the population of foreign learners of chinese has been up to 10 million(source). and the demand of mandarin education is still on growth, so it is a potential market. (Information beyond the case In search of a second actTypes of D (Data, evidence of your argument) 2. Statistics For example: • According to China Daily, the population of foreign learners of Chinese has been up to 10 million (source). And the demand of mandarin education is still on growth, so it is a potential market. (Information beyond the case In search of a second act)