A teacher is explaining about a model of change by giving an example of converting a cube of ice into a cone of ice. The teacher is talking about:

Kurt Lewin was a German-American psychologist widely considered one of the pioneers of modern social psychology. He was born in 1890 and passed away in 1947. Lewin's research and theories significantly impacted the field of psychology, particularly in the areas of social and organizational psychology.

Key Points

One of Lewin's most famous contributions was his model of change, also known as Lewin's Change Model. This model outlines a three-step process for managing change: unfreeze, change, and refreeze. The model is widely used in organizational development and change management and is considered a simple and effective tool for understanding and managing complex change processes.

The model consists of three steps:

• Unfreeze: The first step involves recognizing the need for change and preparing for it. This includes breaking down resistance to change, creating a sense of urgency, and gaining support for the change effort.
• Change: The second step involves making the change. This can involve implementing new processes, systems, or structures and training and communication efforts to support the change.
• Refreeze: The final step involves consolidating and stabilizing the change, ensuring it becomes permanent and integrated into the organization's culture and operations.

The model is often depicted as a linear process, but it is important to note that change can be iterative and that the steps overlap or occur differently.

Hence option 1 is the correct answer.