Project file created by E-Studio, a psychological experiment design tool included with the E-Prime application suite; saves objects that define each step taken on the experiment timeline; may specify setup procedures, stimuli to be injected (such as sounds), data logging procedures, and other actions.

When a design is complete, you can compile it by selecting Run → Generate from the application menu. To run the experiment, select Run → Run. E-Studio projects are used by professionals in behavioral research settings. Experiments present a form of stimulus to the participant and the software records responses such as vocalizations or movements. The software can record input data from serial, parallel, or networked external monitoring tools. NOTE: E-Studio version 1 saves experiment designs using the .ES extension.