If you’ve decided to use an e-learning course for your training needs, you might hear the terms “Level 1 course,” … up to Level 4. These numbers indicate many things — the level of interactivity in the course, the complexity, the sophistication. Maybe you’ve been told that a Level 3 course is the best, while being the most expensive to develop. Or, maybe you’re just wondering what “level of interactivity” means. Here’s a primer.