(Within Limits Integrated Assessment Model)

The WILIAM model (Within Limits Integrated Assessment Model) is a new IAM in the final stage of development within the H2020-LOCOMOTION project. WILIAM is a system dynamics developed model that has been designed based on MEDEAS models to address constraints in the field of IAMs. System dynamics allows capturing complex feedback loops and non-linear relationships between social, economic and environmental variables. WILIAM is composed of 8 modules: (1) demography, (2) society, (3) economy, (4) finance, (5) energy, (6) materials, (7) land and water, and (8) climate. 

WILIAM starts simulating in 2005 and generally simulates until 2060, although the simulation horizon can be extended to 2100. WILIAM is a multi-regional model developed for 9 regions (EU27, UK, USMCA, China, Russia, India, EASOC, LATAM and LROW). 

The ultimate goal is to apply WILIAM to explore the social, economic and environmental implications of long-term socio-ecological transition pathways at both global and regional scales, taking into account planetary boundaries as well as socio-economic constraints. The validation of the models has been carried out following several of the usual model validation procedures in system dynamics. 

WILIAM model and associated products

Vensim, python, visualization apps and game


Github wiki


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