PEST:

Model-Independent Parameter Estimation
and Uncertainty Analysis

Welcome to the PEST web pages.

PEST is the industry standard software package for parameter estimation and uncertainty analysis of complex environmental and other computer models.

PEST is:

• state-of-the art;
• comprehensively documented;
• accompanied by a plethora of utility programs that support its use in conjunction with widely-used groundwater and surface water models;
• free.

Stroll through these pages to:

• find out what PEST does;
• download PEST;
• download a comprehensive PEST tutorial; 
• learn about upcoming PEST events;
• meet other PEST users.

For more information on PEST contact us.

Here are some downloads that can help you quickly learn more about PEST, its philosophical underpinnings, and implications of PEST technology for model-based decision support:-

• a comprehensive tutorial covering highly parameterized inversion and linear/nonlinear model predictive uncertainty analysis;
• a document on model-based environmental decision-support;
• a USGS Scientific Investigation Report "Approaches to Highly Parameterized Inversion: a Guide to Using PEST for Groundwater Model Calibration" ;
• a USGS Scientific Investigation Report "Approaches to Highly Parameterized Inversion: a Guide to Using PEST for Model Parameter and Predictive Uncertainty Analysis" ;
• a USGS Scientific Investigation Report "Approaches to Highly Parameterized Inversion: Pilot Point Theory, Guidelines and Research Directions" .

See the downloads page for much more.

These pages were last updated on 28th December 2011.