Composica 4.0's object oriented approach provides unprecedented control over the efficient reusability of content and its logic. It separates the content, its appearance and its behavior. The look and feel of each course can be swapped out even after the content has been organized because the system keeps styles, navigation rules, and persistent graphics in distinct layers and objects, which are separate from the learning content. 

• Multiple layer control. 

• Reusable assets, Themes, learning objects, and widgets. 

• Comprehensive inheritance - "build once" approach.