Incremental is a library aimed at making it easier to write on-line algorithms, i.e. , algorithms that can efficiently respond to new input data without having to redo the entire computation from scratch. This kind of problem comes up in many circumstances including data-driven UIs or complex modeling based on real-time data. In this tutorial we’ll focus on building a monitoring application with Incremental based on a rapidly changing data set. We will look at techniques that allow you to build efficient views of this data to represent various aspects of the system being monitored.