Complex economic models offer a wide range of options for simulation runs and return a vast amount of data, which has to be explored and exploited in various ways. The GAMS Graphical Interface Generator (GGIG) allows to operate such economic models through a Java based user interface.

GGIG was developed to generalize functionalities originally developed for CAPRI and allows to steer complex applications and to analyze their results based on tables, graphics and maps. It generates a basic Graphical User Interface for GAMS projects based on XML files.

These files define the controls for simulation runs and result exploitation. GGIG is currently used in a number of economic and agricultural modeling projects across the world. Besides GAMS, it also supports applications using the free-ware statistical package R and can also provide input for applications realized in Java. One project might also combine applications using these different languages.

GGIG can be used on Windows and on MAC/Linux.

GGIG is currently used, for instance, in the following projects respectively modeling systems

• CAPRI, where it replaces the former proprietary solution
• CGEBOX, a modular GTAP based CGE, developed together with the GTAP center in Purdue
• The PEM Model of the OECD, release to the user community in February 2016
• The METRO Model of the OECD, a global, trade oriented CGE model
• The IFM-CAP at JRC-IPTS, An EU-Wide Individual Farm Model for Common Agricultural Policy Analysis
• The regional CGEs developed in the CAPRI-RD project
• FARMDYN, a highly detailed, fully dynamic Mixed Integer Single Farm model for dairy farm
• ABMSIM, an Agent Based Model for structural change in agriculture, where itdrives a Java application
• A tool to exploit data from FADN and run different FADN based simulation models, developed in the FADNTOOL project
• The LANA-HEBAMO river basing model for the Lake Naivasha basin in Kenya, developed in the context of the project RCR - Resilience, Collapse and Reorganisation in Social-Ecological Systems of East- and South Africa's Savannahs
• BW-GLOBAL-FOR, a Multi-Commodity model for wood and wood based products
• AGRISPACE, a recursive-dynamic agricultural sector model for Norway

Britz, B., Perez, I. and Gopalakrishnan B.N. (2015): Analyzing Results from Agricultural Large-scale Economic Simulation Models: Recent Progress and the Way Ahead, German Journal of Agricultural Economics 65(2): 106-119

Britz, W. (2014): A New Graphical User Interface Generator for Economic Models and its Comparison to Existing Approaches, German Journal of Agricultural Economics, 63(4): 271-285

February 2021

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June 2016

November 2015

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December 2014

February 2015

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October 2014

Automated test in batch facility, improved HTML output

Support for MAC

Better handling of many controls on one tab

New style options for controls

Support for different projects in one installation

Network graphs added

Beta testing for GTAP in GAMS with GUI based on GGIG to prepare roll-out by GTAP center

Generic decomposition approach using Jacobian information from CONVERT added to "Equation and Variable viewer"

OECD decides to used GGIG for official PEM release

Macros, loops and if conditions in batch mode

Batch mode supports parallel excecution of several GAMS tasks

Table and list controls now can load information from GDX files

Search fields for table columns and rows

Combo boxes can now also be shown as group in own viewport with scrollbars

Export to xlsx besides xls added

Waterfall chart added

Scatter plots added

Policy Evaluation Model (PEM) goes GGIG, used in introductionary class on Agricultural Policy

Support for dependencies between controls

Support for different Look and Feel implementations

Map viewer supports flexible regional aggregation

New file selection control with separate box for sub-directories

Support for SVN version 1.8