Once I figured out how to navigate the system between modules and frames, all seem to go well. I was using an ipad so at times when I wanted to read something on the screen I had to use the scroll at bottom of screen frequently to get the whole picture/words. It became tiring. It could be the speed of my ipad but there were times where I wanted to finish an exercise (click and drag to responses). I had to constantly try to click and drag to drop in appropriate response box(es). Overall it was a good experience. Lots of information, I could work at my speed and review modules I had difficulty.