Outline the situation requiring your response. After documenting it, write down any alternatives that you have for dealing with it. Do not limit yourself to considering only the option you prefer.
Identify all the team members, stakeholders, and others from whom you must obtain buy-in.
From the perspectives of these decision makers, analyze each possible response, noting the benefits, costs, and any possible objections. If your preferred response remains the best overall alternative, develop credible answers for any objections you can anticipate.
Document your analysis, outlining the situation, your proposed response, and clearly specified and quantified benefits and costs. If you expect to have to do a formal presentation, organize it ...