The document discusses controversies and contested issues, and why mapping controversies is useful. It notes that controversies are complex and involve disagreements not just over opinions but also over core questions, relevant experts, and conditions for trusting expertise. While controversies may not be easily settled due to these disagreements, mapping them can provide a fruitful way to learn about science, technology and society. The document introduces controversy mapping as a teaching method and research approach, outlining the phases of a mapping project from understanding concepts to interpreting and presenting maps. It also discusses some key points about controversies from perspectives like actor-network theory.