Final answer:
In the refreezing stage of Lewin's Force-Field Model, the achievement of equilibrium occurs, where new behaviors are solidified within the organization's culture.
Step-by-step explanation:
The aspect of change that takes place in the refreezing stage of Lewin's Force-Field Model is the achievement of equilibrium. This stage is when new behaviors or processes are solidified into the organization's culture, ensuring that the change is maintained over time. During the refreezing stage, employees and organizational processes adapt to the new norms, thus completing the change process outlined by Lewin which consists of the three stages: unfreezing, changing, and refreezing.