Due to the advancement of technology, many data entry clerks no longer work with hand-written documents. Instead, the documents are first scanned by a combined OCR/OMR system (optical character recognition and optical mark recognition,) which attempts to read the documents and process the data electronically. The accuracy of OCR varies widely based upon the quality of the original document as well as the scanned image; hence the ongoing need for data entry clerks. Although OCR technology is continually being developed, many tasks still require a data entry clerk to review the results afterward to check the accuracy of the data and to manually key in any missed or incorrect information.