This document provides guidance on writing a proposal argument, including defining the key components of a proposal claim, establishing presence, using reasons and appeals to justify a proposed action. It discusses special challenges like establishing authority and addressing skepticism. An outline is presented showing how to organize a proposal argument into sections that present the problem, proposal, opposing views, and justification for the proposal. Readers are prompted to ask questions at each stage to ensure their proposal clearly defines the problem, solution, benefits and costs.