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(February 2010) () Document comparison, also known as redlining or blacklining, is a computer process by which changes are identified between two of the same document for the purposes of document editing and review. Document comparison is a common task in the legal and financial industries.

The software-based document comparison process compares a reference document to a target document, and produces a third document which indicates (by colored or by differing font characteristics) information (text, graphics, formulas, etc.) that has either been added to or removed from the reference document to produce the target document. Common documents formats for comparison include documents (e.g. ),, presentations (e.g. ), and (PDF) documents.

Contents • • • • • • • • • • • • Overview [ ] In the broadest definition, document comparison can refer to any act of marking changes made between two versions of the same document and presenting those changes in a third document via a (GUI). There are several variants in the types of changes registered through the process of document comparison. Some programs limit comparison to solely text and table content in word processing documents, while others register changes made in spreadsheets and presentations, along with changes made in versions of PDF documents.

Certain programs also exist that compare changes made to objects like,,, images embedded in documents, and files. Document comparison solutions mark changes made to the following types of documents: Word processing documents Text in paragraphs and in text boxes; bullets and numbering; tables of content; applied styles; design and layout elements; tables, including additions and deletions of rows;; inserted images.

Spreadsheets Values; formulas; additions and deletions to rows and columns, applied styles; design and layout elements. Presentations Text, table, image and other changes. PDF Documents Text, table, image and other changes. It is common for document comparison software vendors to present forms of the compared document in separate windows in a, so that each window contains the following items and the various windows are displayed on one or more computer display monitors: the original document, the modified document, and the redline (or comparison) document, with a fourth window used to present the list of changes made between document versions. Presentation of changes made between document versions are also traditionally customizable. While one standard display of showing deletions with red underlines and additions with blue underlines is still used by many document comparison products, some programs allow users to customize the presentation of changes in the redline/comparison document.

Contract lawyers typically show deletions as red strikethrough text (red text with a line crossing off the words being deleted) and additions with red underlines. History [ ] Document comparison before the personal computer [ ] Prior to personal computers, document comparison entailed the printing of two versions of a single document and reviewing those hard copies in detail for changes and version amendment. Included in this process were the potential for human error and the expansive administrative time necessitated by this arduous process. First generation document comparison [ ] With the advent of personal computers and the ubiquity of word processing software, the need arose to find a way to manage changes made to document versions shared via disk, and later email. The importance of mitigating risks associated with potential document changes became essential as the amount of document and revision sharing increased. The early, first-generation document comparison software solutions provided robust document review, checking all the text in two documents for changes, and then presenting those changes in a third redline/comparison version. Second generation document comparison [ ] As documents changed and evolved, so did document comparison solutions.

The second generation of documents began utilizing tables to manage a multiplicity of document layouts. Many document comparison solutions had difficulty comparing tables in document versions. These solutions first converted tables to text arrays and then compared the created arrays. In many cases, not enough due diligence on the software’s part was conducted; users would not be informed of sections that were not successfully compared. In the second generation, Microsoft’s Track Changes option was also introduced. With Track Changes, all changes made to documents were captured and stored inside the document.

Flaws in the functionality of Track Changes could render the documents unusable and some comparison offerings again had difficulty managing the complex process of comparing in a Track Changes environment. Third generation document comparison [ ] Before third generation technology, it was common for organizations to be required to use multiple documents for one product.

A main document with various supporting documents would be used to present and share necessary information. However, the third generation of documents (especially Microsoft Word) enabled multiple types of information to be presented in a single document. Compound documents could include text, tables, and various styles, and could also include a range of embedded objects, such as,,, and objects, and inserted images in a range of types (including jpg, tiff, bmp, and gif). While this enhancement greatly increased the usefulness of documents, it added an entirely new layer of risk to organizations that needed to fully understand changes made to document versions. The majority of document comparison software programs have not yet included mechanisms to mitigate the risk related to changes inside of embedded objects.

The software program that can compare changes made in embedded objects provides pixel-to-pixel comparison of images and cell-level comparison of embedded Excel and other changes made to these complex, compound documents. Business Relevance [ ] Document comparison provides a method of. Individuals and organizations are able to assure that changes requested have been integrated properly into documents. Additionally, document comparison provides assurances that no unwarranted changes were made. Document comparison in the legal industry [ ] Because lawyers and legal professionals regularly share documents with opposing counsel and because the documents constructed in this business vertical may be binding on either side's clients, a complete mitigation of risks associated with changes made to documents is essential. If opposing counsel makes a change that is not detected by the lawyer, such a change could negatively affect the lawyer's client and the lawyer could be liable for the damages. Document comparison in banking, finance, and accounting [ ] Because professionals in these industries manage large amounts of data in spreadsheets and because one change to a value or formula could affect a substantial amount of data, professionals in the banking, finance, and accounting industries find document comparison (such as comparison of two versions of a MS Excel spreadsheet) to be extremely useful in assuring accuracy in document change management.

Creative media management and publishing [ ] Professionals in these industries regularly work with multiple versions of single documents. Document comparison software helps these professionals ensure that all changes have been acceptably integrated into latest versions and provides them with a speedy understanding of changes made in editing and versioning of the documents they work with. References [ ] • Kennedy, Dennis M.; Mighell, Tom (2008). The Lawyer's Guide to Collaboration Tools and Technologies: Smart Ways to Work Together.

American Bar Association.. Clearview Keygen. • Heiser, Jay (2005). Recognize the Risks of Uncontrolled Spreadsheets. External links [ ] •.