This document provides guidelines for effectively defending a position in writing. It discusses identifying an arguable issue, taking a clear stance, and supporting arguments with credible evidence from research. Types of supporting evidence include factual knowledge, statistical data, informed opinions, and testimony. The document also emphasizes knowing the target audience to tailor the argument, such as considering their beliefs and interests to build common ground. Overall, the key to a strong position paper is presenting a reasonable opinion backed by sufficient evidence from reliable sources.