Most of them are fairly strong at reading and writing, but have much problem with listening and speaking. On the other hand, the course books tend to be used for years without updating its content, which implies an obsolescence of course materials. What is more, the language and thinking skills are introduced and practiced in real-world situations so that what the learner is learning is closely related to the real situation. For example, the learners are encouraged to develop the skills of being able to read commercials, maps, charts, and graphs, the content areas that are often neglected and rarely covered in Chinese course books. If this learning package should be adopted in Chinese educational settings, some improvement or modification would seem necessary.
Cost is one of the most important factors.
If cost could be reduced by one third or even by half, I am pretty sure this instructional package will enjoy a potentially large market. For adult learners, Math section is not very important though it can be so for middle school students. Therefore, it would be more practical if the package could be sold separately. Lastly, I am wondering if some audio and oral skills in English could be designed into this package so as to make it more suitable for Chinese adult learners.