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GAMS Graphical User Interface Generator (GGIG)


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.

Where is GGIG used?

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



GGIG user guide, 174 pages, Version March 2021

GGIG programming guide, 84 pages, Version March 2021

Slides on GGIG

Dummy installation as a starting point to develop a GGIG project (start with gui\test.bat)

Some examples how to work with globals in GAMS, useful for working with GGIG


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

Recent changes

February 2021 Automated test in batch facility, improved HTML output
January 2018 Support for MAC
September 2017 Better handling of many controls on one tab
May 2017 New style options for controls
June 2016 Support for different projects in one installation
November 2015 Network graphs added
October 2015 Beta testing for GTAP in GAMS with GUI based on GGIG to prepare roll-out by GTAP center
October 2015 Generic decomposition approach using Jacobian information from CONVERT added to "Equation and Variable viewer"
September 2015 OECD decides to used GGIG for official PEM release
September 2015 Macros, loops and if conditions in batch mode
August 2015 Batch mode supports parallel excecution of several GAMS tasks
June 2015 Table and list controls now can load information from GDX files
May 2015 Search fields for table columns and rows
May 2015 Combo boxes can now also be shown as group in own viewport with scrollbars
December 2014 Export to xlsx besides xls added
February 2015 Waterfall chart added
January 2015 Scatter plots added
Spring 2015 Policy Evaluation Model (PEM) goes GGIG, used in introductionary class on Agricultural Policy
December 2014 Support for dependencies between controls
December 2014 Support for different Look and Feel implementations
November 2014 Map viewer supports flexible regional aggregation
October 2014 New file selection control with separate box for sub-directories
October 2014 Support for SVN version 1.8

Last updated: Thursday, March 25, 2021