Any teacher can upload courseware to Cchatty with only PDF file format, and the teacher can set the price range from 1 CSP to 10 CSP.
Standards for a qualified courseware:
1, A set of courseware instead of alone courseware;
2, Unique content but not repeated;
3, Self-making rather than copy others, no copyright issues;
4, The content of one courseware is within 1.5 hours course;
5, With English annotation or other target languages;