Yes, case studies can be effectively used to illustrate the application of game theory, decision-making models, and negotiation strategies in international relations scenarios for Political Science and International Relations (PSIR). Case studies provide real-world examples that allow students to analyze and understand the practical application of these concepts in international relations.

Game Theory:
- Game theory is the study of strategic decision-making in situations where the outcome of one person's decision depends on the decisions of others.
- Case studies can be used to analyze how game theory can be applied to international relations scenarios.
- For example, a case study can focus on the Prisoner's Dilemma game to explain how countries may make decisions based on mutual cooperation or self-interest. The case study can analyze the strategies used by different countries and the outcomes of their decisions.

Decision-making Models:
- Decision-making models provide a framework for analyzing and making decisions in complex situations.
- Case studies can be used to demonstrate how decision-making models, such as the Rational Actor Model or Bounded Rationality Model, can be applied in international relations scenarios.
- For instance, a case study can examine the decision-making process of a country during a crisis or conflict, highlighting the factors that influenced their choices and the consequences of those decisions.

Negotiation Strategies:
- Negotiation strategies are crucial in international relations, as countries often engage in diplomatic negotiations to resolve conflicts and reach agreements.
- Case studies can showcase the application of negotiation strategies, such as win-win or zero-sum approaches, in international relations.
- For example, a case study can analyze a successful negotiation process, such as the Iran Nuclear Deal, and highlight the strategies employed by the negotiating parties to achieve a mutually beneficial outcome.

Benefits of Using Case Studies:
- Real-world examples: Case studies provide practical examples that students can relate to, enhancing their understanding of theoretical concepts.
- Critical thinking: Analyzing case studies encourages students to think critically and apply theoretical knowledge to real-world scenarios.
- Practical skills: Case studies help develop essential skills such as problem-solving, decision-making, and strategic thinking.
- Contextual understanding: Case studies provide context and nuance to complex international relations issues, allowing students to grasp the multidimensional nature of these scenarios.

In conclusion, case studies are an effective tool to illustrate the application of game theory, decision-making models, and negotiation strategies in international relations scenarios for PSIR. By analyzing real-world examples, students can develop a deeper understanding of these concepts and their practical implications in the field of international relations.