Key Themes Covered under Administrative Thought:

1. Classical Approach:
The classical approach to administrative thought focuses on the principles of administration proposed by theorists like Henri Fayol and Max Weber. It emphasizes the hierarchical structure of organizations, the division of labor, and the importance of clear lines of authority and responsibility. This approach also highlights the need for efficient coordination and control in order to achieve organizational goals.

2. Public Administration as a Science:
This theme explores the idea of public administration as a scientific discipline. It delves into the theories and methods used to study and understand administrative processes and systems. It involves the application of scientific principles, such as observation, analysis, and experimentation, to improve administrative practices and decision-making.

3. Behavioral Approach:
The behavioral approach to administrative thought focuses on understanding and managing human behavior within organizations. It examines the impact of individual and group behavior on administrative processes and outcomes. This theme emphasizes the importance of motivation, communication, leadership, and organizational culture in achieving effective administration.

4. Public Administration as a Political Process:
This theme explores the intersection of public administration and politics. It examines how administrative decisions and actions are influenced by political factors, such as public opinion, interest groups, and government policies. It also analyzes the role of bureaucracy in implementing and enforcing public policies and regulations.

5. Administrative Ethics and Values:
This theme highlights the ethical dimensions of administrative thought. It explores the principles and values that guide administrative decision-making and behavior, such as integrity, transparency, accountability, and fairness. It also discusses the ethical challenges faced by administrators and the importance of ethical leadership in promoting public trust and good governance.

6. Comparative Public Administration:
This theme involves the comparative analysis of administrative systems and practices across different countries and cultures. It explores the similarities and differences in administrative structures, processes, and outcomes. It aims to identify best practices and lessons that can be applied in different contexts to improve administrative performance.

7. Administrative Reforms:
This theme focuses on the need for continuous improvement and reform in administrative systems. It discusses the challenges and strategies involved in managing change, enhancing efficiency, and promoting innovation in public administration. It also explores the role of technology and digital transformation in modernizing administrative processes.

In conclusion, the key themes covered under the heading of "Administrative Thought" in Paper 1 of the UPSC exam include the classical approach, public administration as a science, the behavioral approach, public administration as a political process, administrative ethics and values, comparative public administration, and administrative reforms. These themes provide a comprehensive understanding of the theories, principles, and practices that shape administrative thought and guide administrative decision-making and behavior.