GSE Systems, Inc. (GSE) is a performance improvement company. The Company operates through two segments: Performance Improvement Solutions, and Nuclear Industry Training and Consulting. The Performance Improvement Solutions segment provides simulation, training and engineering products and services to the industries, including nuclear and fossil fuel power industry, and chemical and petrochemical industries. The Performance Improvement Solutions segment consists of its power plant and process simulation solutions, as well as engineering solutions. The Nuclear Industry Training and Consulting segment provides specialized workforce solutions primarily to the nuclear industry, working at client's facilities. The EnVision product line consists of computer-based tutorials and related simulation models primarily for the petrochemical, and oil and gas refining industries.