The E-Run application logs data to a text file as an experiment is in progress. The data in this text file is a flat text file. When the experiment is completed, the E-Run application converts this flat file into an E-Prime data file. The data in the E-Prime data file is in a Spreadsheet format, which enables the hierarchical structure of the data to be displayed. E-Run logs data to the text file in a reversed arrangement, so the deepest levels are logged foremost trailed by their parent levels. For example, in an experiment with two blocks of ten trials in each block, E-Run would log the data for the first ten trials followed by the data for the first block. Then the data for the second ten trials would be logged, followed by the data for the second block, and then finally data for the session. By using E-DataAid, the E-Prime data file displays the data in a usable and comprehensible spreadsheet format.
However, there may be times when the conversion from the E-Run text file (.txt) to the E-Prime data file (.edat3) does not occur (e.g., the experimenter terminates an experiment early by pressing Ctrl+Alt+Shift), or the .edat3 file may simply be missing. The E-Recovery program (E-RECOVERY: E-Recovery Interface ) converts a .txt file selected by the user into an .edat3 file. The E-Run application logs a limited amount of recovery information to the beginning of each E-Run text file. This information includes at least the experiment name, the subject number, and the session number. E-Recovery uses this information when reconstructing the session data (E-RECOVERY: Recovering Files ).