You are the project manager for a project that is in the beginning stages. You have identified approximately 30 stakeholders, not including members of the future project team. You are in the process of analyzing the potential impact or support that each stakeholder could generate, and you are classifying the stakeholders to figure out how to approach each stakeholder.

There are four different classification models used in a stakeholder analysis. What are the four different classification models? Describe each model's advantages and disadvantages.