Online Instruction

Besides all the advantages of an e-learning course, I realized the following disadvantages of e-learning based on my experience:
1. Asynchronous learning may makes the learners out of track of the core learning content.
2. When in the case of traditional in-class learning take place every week, e-learning course may schedule to give learners more self-study time which may cause inefficiency to go through the learning curve.
3. Learners may feel isolate in the virtual learning environment with less learning context explored. The learners don't meet their classmates face to face, which decreases the possibilities to build a healthy social network and learning community.
4. It is difficult for learners to communicate with their instructor. The learners may not be able to get immediate (within 48 hours) feedback from the instructor.