The fourth criterion to consider when choosing negotiation tools and frameworks is your counterpart. Who are you negotiating with? What are their objectives, style, context, and behavior? Your counterpart can influence how you interact, respond, and cooperate with them in the negotiation. Depending on your counterpart, you can use different tools and frameworks to analyze, anticipate, or influence their negotiation strategy. For example, if your counterpart has different objectives than you, you can use tools like the interest matrix, the value proposition, or the trade-off analysis to uncover and align their interests, create and communicate your value proposition, and make and request trade-offs that benefit both parties. If your counterpart has a different style than you, you can use frameworks like the style assessment, the style adaptation, or the style feedback to identify and understand their style, adapt and adjust your style, and give and receive constructive feedback. If your counterpart has a different context than you, you can use tools like the cultural dimensions, the etiquette guide, or the protocol checklist to learn and respect their cultural values, norms, and preferences, follow the appropriate etiquette and protocol, and avoid cultural misunderstandings or offenses. If your counterpart has a different behavior than you, you can use frameworks like the behavior observation, the behavior diagnosis, or the behavior intervention to observe and interpret their behavior, diagnose and address the underlying causes, and intervene and manage their behavior effectively.