In the past, educators have relied upon the content of textbooks and supplemental printed materials. While convenient, these sources often contained information that was dated and presented it in a manner that may not have reflected the most current thinking. As our society increasingly focuses on one's ability to both acquire and make sense of information, there will be an increasing emphasis on this skill for students. Not every lesson is Internet compatible. The best Internet assignments are those that are research orientated.
Every lesson has to have rationale, objectives and a way to evaluate.
Assign students to groups. Good Web assignments encourage small group work. Besides, working with someone else is more interesting, fun and doubles the problem solving power. Generate time lines to help students stay focused. It's easy to get distracted on the Internet.