Threshold 21 Model
Threshold 21 (T21) is a dynamic macroeconomic model designed to support comprehensive, integrated long-term development planning. T21’s ability to include environmental and social factors in its analyses provides policy makers key insight into the potential impact of development policies across a wide range of sectors. T21’s System Dynamics approach reveals how different strategies interact with one another, allowing planners to create realistic and effective approaches to achieving their goals and objectives.
When to Use This Tool
This tool is most useful for development impacts assessments focused on:
Learn more about the topics for assessing the impacts of low-emission development strategies (LEDS).
The model focuses in three spheres: economy, environment and society. Each sphere is divided in sectors. For example, the environment sphere is divided in land, water, emissions, sustainability, minerals, energy, etc.
How to Use This Tool
General and technical introduction are provided
Level of Expertise
Descriptions of the relevant sectors in the model. Examples of sectors include water, energy, minerals, emissions, technology, labor, education.
Examples of how Threshold 21 Model has helped people assessing the impacts of low-emission development strategies in countries and regions:
T21 publications can be downloaded form here: http://www.millenniuminstitute.net/resources/elibrary/index.html
"Threshold 21 (T21) is a dynamic simulation tool designed to support comprehensive, integrated long-term national development planning. T21 supports comparative analysis of different policy options, and helps users to identify the set of policies that tend to lead towards a desired goal. This insight into how different indicators of development interact with one another to produce an outcome deepens users understanding of development challenges.
T21 was developed from more than 20 years of extensive research and application carried out in consultation with the World Bank, UN agencies, developing country governments, and non-governmental organizations.
T21 is transparent, collaborative, interconnected, robust, and customizable, and includes many critical features that support an inclusive, comprehensive, and integrated development planning process. Models that are customized for countries are based on the "T21 Starting Framework", a set of interconnected sectors combined into a rigorous macroeconomic framework. The sectors and their interrelations represent the fundamental mechanisms that are responsible for socio-economic development."