1) It's a small corpus (1.7 million words) designed specially for ESL teaching, especially those who use NHCE coursebooks and online learning system. As such, it is not appropriate, in my own judgement, for other research purposes;
2) The corpus contains all scripts found in the coursebook series (excluding the latest Viewing, Listening and Speaking textbooks). No other kinds of text materials are included;
3) The corpus is online, accessible to all the teachers who use the NHCE textbook series. Texts in the corpus are not tagged. Users can search the corpus for collocations (only).