It's important to consider how each student learns and know a bit about their backgrounds. That's why having a first day required online introduction is important and the instructor needs to be specific about what they would like to see in their student posts.
Traditional Courses are great for people who thrive in that environment and they have the time. Hybrid Courses are important for adults continuing their education and need a flexible schedule. Some students may have never taken an online course before and may have limited to no computer skills. There will also be students that are returning to school after 10 years or more. Those students may need a little more help getting started.
