This document discusses Hudson, an open source continuous integration (CI) tool. It describes what Hudson is, what CI is, and how Hudson can reduce deployment and maintenance costs. Hudson automates tasks like checking code quality, running tests, and publishing results. By implementing CI with small, frequent changes, the quality and delivery of software can be improved compared to traditional development practices. The document provides an example workflow of how Hudson can automatically check coding standards, run tests, and generate performance reports when a Drupal site is deployed.