What are the potential problems?
• Because CBI isn't explicitly focused on language learning, some students may feel confused or may even feel that they aren't improving their language skills. Deal with this by including some form of language focused follow-up exercises to help draw attention to linguistic features within the materials and consolidate any difficult vocabulary or grammar points.
• Particularly in monolingual classes, the overuse of the students' native language during parts of the lesson can be a problem. Because the lesson isn't explicitly focused on language practice students find it much easier and quicker to use their mother tongue. Try sharing your rationale with students and explain the benefits of using the target language rather than their mother tongue.
• It can be hard to find information sources and texts that lower levels can understand. Also the sharing of information in the target language may cause great difficulties. A possible way around this at lower levels is either to use texts in the students' native language and then get them to use the target language for the sharing of information and end product, or to have texts in the target language, but allow the students to present the end product in their native language. These options should reduce the level of challenge.
• Some students may copy directly from the source texts they use to get their information. Avoid this by designing tasks that demand students evaluate the information in some way, to draw conclusions or actually to put it to some practical use. Having information sources that have conflicting information can also be helpful as students have to decide which information they agree with or most believe.