Demographic transition

Image above: The Demographic Transition Model (DMT)

 
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Population change as time goes by

Populations, including the demographic variables of total number of people, age breakdown, sex ratios, birth rates, death rates and rate of growth are not static but change over time as the conditions in a country change for the better or worse. In most countries, such change involves development and the associated improvements in health and social conditions as a result of industrialisation and economic improvements in a country. The following sites attempt to explain the modelling of such changes over time and introduces the DemographicTransition Model (DMT). The DMT is a model that describes a predicted and in most cases expected population change over time. It is based on an interpretation begun in 1929 by the American demographer Warren Thompson, of the observed changes, or transitions, in birth and death rates in industrialized societies over the past two hundred years or so. Although not perfect and as always there ar exceptions to the model (rule), the DMT is used by demographers as a way to look at population change over time.

* Some basic demographic terminology

* Video explaining thedemographic transition model

* Videos explaining the impact of development on a countries population and the Demographic Transition Model (DTM)
http://wn.com/demographic_transition_theory
http://wn.com/demographic_transition_theory

* A detailed look at the stagesof the DMT

* A good summary of the DMTstages

* A corny but accurate animation

* Worth looking at the Age-Sex Pyramid animation showing the movement through the stages of the DMT (from youthful population to the ageing population).

* Youthful and Ageing populations

* Youthful population video

* Ageing population video

* More animations to aid understanding (simple, a little annoying but useful)