This document discusses how to create effective web-based simulations and interactive data visualizations. It recommends that simulations be easy to understand, convenient to access, and enjoyable to use. To be easily understandable, simulations should use basic visual elements like charts, graphs, text, images and video. To be convenient, they should be accessible on different devices and browsers without requiring plugins. To be enjoyable, simulations can incorporate elements from casual games like leveling up, rewards and player communication. Overall, the document emphasizes simplicity in design and usability.