Managing the Inventory of Test Items used in Computer-Based Educational Testing

Client: Educational Testing Service (ETS), the world’s leading developer and provider of standardized educational tests

Authors/Consultants: Homer J

In the mid-1990s, ETS started a transition from paper-and-pencil testing to computer-based testing for all of its graduate-level tests. Computer-based tests, offered on an almost daily basis at many test locations around the world and throughout the […]

Cocaine Use Prevalence Estimation and Policy Analysis

Client: National Institute of Justice, US Department of Justice

Authors/Consultants: Homer J

A system dynamics model reproduces a variety of national indicator data reflecting cocaine use and supply over a 15-year period and provides detailed estimates of actual underlying prevalence. Sensitivity testing clarifies the source of observed trends. Alternative scenarios with possible policy implications were […]

Antibiotic Resistance Dynamics

Client: Texas Department of Health

Authors/Consultants: Homer J, Ritchie-Dunham J, Rabbino H, Puente L, Jorgensen J, Hendricks K

Many common bacterial pathogens have become increasingly resistant to the antibiotics used to treat them. The evidence suggests that the essential cause of the problem is the extensive and often inappropriate use of antibiotics, a practice that […]

Hospital Surge Capacity Planning

Client: Health Resources and Services Administration (HRSA), US Department of Health and Human Services

Authors/Consultants: Manley W, Homer J, Hoard M, Roy S, Furbee P, et al.

A system dynamics model was developed to help hospitals assess their ability to handle surges of demand during various types of disasters. The model represents all major flows […]

Local Strategy for Chronic Disease Management and Prevention

Client: a large hospital in Washington State

Authors/Consultants: Homer J, Hirsch G, Minniti M, Pierson M

Experts agree that the U.S. healthcare system is poorly organized to care for chronic illnesses and wasteful and unresponsive to the needs of patients. The “Pursuing Perfection” program sought to improve chronic care in Whatcom County, Washington State. SD […]

Obesity Population Dynamics

Client: Centers for Disease Control and Prevention (CDC)

Authors/Consultants: Homer J, Milstein B, Dietz W, Buchner D, Majestic E

A system dynamics simulation model was developed for understanding trends in obesity in the United States. Data on population body weight from 1971-2002 were combined with information from nutritional science and demography into a single analytic […]

National Health System Reform Strategy

HealthBound

 

Name National Health System Reform Strategy Modelers Bobby Milstein, Jack Homer, Gary Hirsch

Client/Participant Centers for Disease Control and Prevention (CDC) Client Type Government

 

The Issue You Tackled Proposals to improve the US health system are commonly supported by models that have only a few variables and overlook certain processes […]

Cement Industry Price Dynamics in Iran

Client: Cement Investment and Development Company

Authors/Consultants: Ghaffarzadegan N, Tajrishi AT

The project was conducted from September 2005 to May 2006 for the Cement Investment and Development Company (CIDCO). CIDCO is a major cement company that holds around a 12% share of Iran’s market and owns six major factories in Iran. During the time that […]

National Airspace System

Client: US Federal Aviation Administration

Authors/Consultants: Ventana Systems

For the US Federal Aviation Administration, Ventana developed a comprehensive National Airspace System (NAS) Strategy Simulator. The simulator provides a framework to evaluate infrastructure and regulatory strategy. To achieve realism without getting bogged down in massive detail, the model aggregates participants into communities, each acting in its […]

Monetary Policy in Colombia

Client: Central Bank of Colombia

Authors/Consultants: Arenas F, Hamann F

The Pontificia Universidad Javeriana (Columbia) and the Central Bank of Colombia cooperated in an effort to recast the bank’s MTM (Mechanism of Transmission Model) into a system dynamics model. This joint effort represents an application of system dynamics to macroeconomics.

There are three options for […]