Here, you can see why we created CHiLO Book in an ebook form.

The fishbone structure enables learners to learn thoroughly from the beginning to end by just turning the pages of the CHiLO Book.

It has interoperability. It takes the form of an ebook, so you can browse using any devices as well as servers.

It is mobile friendly, which enables you to read CHiLO Book on both smartphones and PCs.
 
As for the usability, just turn the pages like a paper book. There is no need for explanations or instruction manuals. Just read on and keep on studying!