Item Unique Identification
Tangible items are distinguished from one another by the assignment of a unique identifier in the form of a unique data string and encoded in a bar code placed on the item. An item unique identifier is only assigned to a single item and is never reused. Once assigned to an item, the IUID is never changed even if the item is modified or re-engineered. IUID is similar to social security numbering used to distinguish citizens of the United States from one another. In the case of a lot or batch of items that are not individually serialized, the entire lot or batch may have a unique identifier assigned. For example, a manufacturer might place a unique IUID physical mark on the exterior of a kit or container that holds a gross quantity of mission critical items. The government would refer to this IUID at the point of acceptance. The entire gross quantity in this case is treated as a single item. In this case, the IUID is no longer useful after the items are separated, and the individual items from the batch or lot are never uniquely identified. IUID is physically marked on tangible items or assets using a two-dimensional (2D) Data Matrix symbol with the data formatted in accordance with specified standards. The encoded data is identified by the use of data identifiers, application identifiers or text element identifiers. The choice of which identifier to use is based upon normal industry practices of the organization assigning the serialization. The formatted data is called a Unique Item Identifier (UII). The Data Matrix symbol is a machine-readable representation of the UII. When DoD requires this marking it shall be applied directly to the surface of the item or shall be applied to an identification plate, tag or label securely fastened to the item. The UII is intended to be a permanent mark and cannot be changed over the life of the item. To create a compliant unique item identifier, all required information about the part and the organization producing it is linked together – concatenated – into a single data field of up to 50 numeric, alphabetic or alphanumeric characters. This data must be entered into the IUID Registry to “ensure uniqueness” of each item submitted for listing in the registry. This unique item identifier can also see use within manufacturing, maintenance and logistics organizations for any number of varied purposes. Marking of tangible items or assets in accordance with IUID policy is mandated by incorporating Defense Federal Acquisition Regulation Supplement (DFARS) clause 252-211-7003 in DoD contracts. Per the UID standard, a 2D Data Matrix bar code that is applied with either direct part UID-marking techniques or labels must also prove to be generated to a level of quality that meets the standards set by the International Organization for Standardization (ISO) and the Society of Automotive Engineers (SAE). UID Markings and 2D Matrix Barcode Symbols can be created on a variety of surfaces. Generally UCC.EAN, ANSI MH 10.8.2 or ATA style descriptors are used for UID-marking symbol. Vendors supplying parts to the Department of Defense are required to supply parts with UID Data Matrix Symbols conforming to MIL-STD 130M standard. By using a Data Matrix Symbol laser etching system to engrave a UID onto each part, items can be uniquely identified by manufacturer, part number and serial number. UID bar code must be maintained as a readable bar code throughout the entire life of the item; hence strong consideration must be given to the UID-marking methodology. Metal tag with a permanent adhesive or durable polyester label are suitable for many environments but other marking items such as laser etch, dot peen, Metalphoto photosensitive anodized aluminum, chemical etch or ink jet can also be used for direct part Unique Identification. The following methodologies (constructs) and equivalents are approved:

The following IUID Equivalents are also approved:


Accepted Issuing Agencies: Department of Defense Instruction (DoDI) 8320.04 mandates that the following tangible items are marked with an item unique identifier:




Responsibility - Often, the question of responsibility for IUID comes into light when multiple organization are involved in the production and/or procurement of items. According to the guidance, IUID is required at the component level based on a program manager determination. Program managers should be interpreted as any activity member who manages the requirement for procurement of an item. This would include personnel such as Integrated Support Team Managers, Systems Managers, or Item Managers. The prime contractor is responsible for ensuring uniqueness. The prime contractor can direct their vendors to use the prime's EID. However, from a manufacturing process perspective, this may not be the most efficient and effective way for their vendors to mark parts. If the item does not already have unique identification and meets IUID criteria, the enterprise furnishing the item to the Government must provide unique item identification marking as part of the purchase price. In situations where sub-contractors are furnishing items to the prime contractor, it is the responsibility of the prime contractor to ensure that the items are marked in accordance with the IUID requirements prior to furnishing to the Government, either by flowing down the requirements to the subcontractor or marking the item themselves. The prime will also have the added responsibility of ensuring uniqueness of the subcontractor's serial number within the prime's enterprise (Construct #1) or the subcontractor's serial number within the subcontractor's part number within the prime's enterprise (Construct #2). Marking and printing is the first and foremost step of the UID Compliance process. This marking is nothing but the 2D data matrix code. Dot peen, chemical etch, laser mark, durable polyester or ink jet are generally used for marking. After conforming to the set standards with regard to printing and marking, the next step is syntax and formatting. Before the items are ready to be received they must be scanned and tracked for checking accuracy and hence this step is crucial. Then comes the reporting phase where the UID meeting requirements are tracked to the item-specific location. The IUID data is submitted to the WAWF (Wide Area Work Flow) and UID Registry In the last step of IUID compliance. All the contracts, deliverables and government properties, that meet the criteria, possessed by the contractors need to be marked with this 2D data matrix code standard. It is mandatory for all suppliers to be UID Compliant who deliver their items to the DoD. All the items and properties either owned by or in the contract with the [DoD], and that meet the criteria, need to be identified with a unique serialized identification number and for them UID Compliance standard is obligatory. This identification number is very essential for meeting the MIL STD 130 standards. IUID - Item Unique Identification is the strategic system implemented by the DoD to enhance the traceability of the property. UID - Unique Identification, the term UID is commonly used for different things and sometimes used in place of IUID, and thus can be a source of confusion. Generally, "The UID" refers to the physical mark on the asset or the UID Label. UII - The Unique Item Identifier is a set of data for an asset(s) that is globally unique and unambiguous, ensures data integrity and data quality throughout life, and supports multi-faceted business applications and users. 2D Matrix - The 2D Data Matrix symbol marked on the item contains data compression, redundancy, and additional information to aid in decoding. This information can be translated by an MRI device (per ISO-15343) and concatenated into a human-readable string of 50 characters or less per MIL-STD-130N. (Note that this limit was previously 78 characters in MIL-STD-130M, superseded in December 2007.) The human-readable concatenated UII (Unique Item Identifier) is properly referred to as the IUII or "Individual Unique Item Identifier". The IUII provides a high probability of being globally unique, regardless of context. IUID Registry - The U.S. Federal Government maintains an IUID Registry data system to store records for all assets marked and delivered to the government or are in the custody of contractors. The registry also stores "Virtual IUID" information for assets that fall under IUID criteria but are unable to be marked (mainly due to asset location constraints) The IUID Registry can be publicly accessed online. Virtual IUID - Asset data is uploaded to the registry as with normal IUID but the asset is not physically marked until a trigger event occurs (such as maintenance, transportation, or inspection). Commonly used when an asset is located overseas or in use and scheduled to return to a central location. The following enumeration constructs are approved:
Policy
Unique Identification Marking, UID marking, Item Unique Identification or IUID, is a part of the compliance process mandated by the United States Department of Defense. Only after the products have UID-marking containing uniquely identified numbers, they are eligible for IUID Registry.