Final answer:
Lewin's change-model includes the steps Unfreeze, Change, Freeze, and is associated with organizational change. The fourth stage in population growth models usually signifies a declining population, which aligns with the 'Drive to maturity' in Rostow's model of economic development.
Step-by-step explanation:
Lewin's change-model consists of three main steps which are: Unfreeze, Change, and Freeze. This model is used to understand and manage the change process within organizations or social groups. When looking at population dynamics, particularly the age structure diagrams representing various stages of population growth such as rapidly growing, slow growing, and stable, the fourth stage is often considered to represent a declining population. In Rostow's model of economic development, stage 4 is referred to as the 'Drive to maturity' which signifies the development towards a more advanced economy, which might be associated with lower population growth rates relative to the earlier stages.