The study aimed at improving various skills may not be with the students. Because each has the knowledge, skill and no little skill can pull out there as good as expected, because of a lack of practice.
The study aimed at developing skills may not be good for the students, as they should. Since there is little knowledge of the individual skills and skills that can not be pulled out to be poor due to lack of practice.
Learning aims to develop skills may not be advantageous to the students as far as possible. Because there is little knowledge in each skill and cannot be pulled out is a good skills with as it should be because of the lack of training.