The LONI Provenance Editor is a self-contained, platform-independent application that automatically extracts the provenance information from an image header (such as a DICOM image) and generates a data provenance XML file with that information. The Provenance Editor also allows the user to edit data prior to saving the provenance file, correcting inaccuracies or adding additional information (see figure 1 on the left). This provenance information is stored in .prov files, an XML formatted file that contains both the data and processing provenance and follows the XSD definition (Table 1). These files must be structured so that the description of the project, subject, and acquisition come before the processing provenance. Sequential processing steps appear sequentially in the file.