Interoperability is a property referring to the ability of diverse systems and organizations to work together (inter-operate). The term is often used in a technical systems engineering sense, or alternatively in a broad sense, taking into account social, political, and organizational factors that impact system to system performance.

[edit] Definition

The IEEE defines interoperability as:

the ability of two or more systems or components to exchange information and to use the information that has been exchanged.^[1]

James A. O'Bien and George M. Marakas define interoperability as: Being able to accomplish end-user applications using different types of computer systems, operating systems, and application software, interconnected by different types of local and wide area networks.

[edit] Syntactic interoperability

If two or more systems are capable of communicating and exchanging data, they are exhibiting syntactic interoperability. Specified data formats, communication protocols and the like are fundamental. In general, XML or SQL standards provide syntactic interoperability. This is also true for lower-level data formats, such as ensuring alphabetical characters are stored in ASCII format in both of the communicating systems.

Syntactical interoperability is required for any attempts of further interoperability.

[edit] Semantic interoperability

Beyond the ability of two or more computer systems to exchange information, semantic interoperability is the ability to automatically interpret the information exchanged meaningfully and accurately in order to produce useful results as defined by the end users of both systems. To achieve semantic interoperability, both sides must defer to a common information exchange reference model. The content of the information exchange requests are unambiguously defined: what is sent is the same as what is understood.

[edit] Telecommunications

In telecommunication, the term can be defined as:

1. The ability of systems, units, or forces to provide services to and accept services from other systems, units or forces and to use the services exchanged to enable them to operate effectively together.
2. The condition achieved among communications-electronics systems or items of communications-electronics equipment when information or services can be exchanged directly and satisfactorily between them and/or their users. The degree of interoperability should be defined when referring to specific cases.

Source: from Federal Standard 1037C and from the Department of Defense Dictionary of Military and Associated Terms in support of MIL-STD-188.

In two-way radio, interoperability is composed of three dimensions:

• compatible communications paths (compatible frequencies, equipment and signaling),
• radio system coverage or adequate signal strength, and;
• scalable capacity.

[edit] Software

Interoperability: playing the two role network game, when one of the player clients (top left) runs under Sun Microsystems and another under GNU Classpath with JamVM. The applications execute the same bytecode and interoperate using the standard RMI-IIOP messages for communication

With respect to software, the term interoperability is used to describe the capability of different programs to exchange data via a common set of exchange formats, to read and write the same file formats, and to use the same protocols. (The ability to execute the same binary code on different processor platforms is 'not' contemplated by the definition of interoperability.) The lack of interoperability can be a consequence of a lack of attention to standardization during the design of a program. Indeed, interoperability is not taken for granted in the non-standards-based portion of the computing world.

According to ISO/IEC 2382-01, Information Technology Vocabulary, Fundamental Terms, interoperability is defined as follows: "The capability to communicate, execute programs, or transfer data among various functional units in a manner that requires the user to have little or no knowledge of the unique characteristics of those units". [1]

Note that the definition is somewhat ambiguous because the user of a program can be another program and, if the latter is a portion of the set of program that is required to be interoperable, it might well be that it does need to have knowledge of the characteristics of other units. This definition focuses on the technical side of interoperability, while it has also been pointed out that interoperability is often more of an organizational issue: often interoperability has a significant impact on the organizations concerned, raising issues of ownership (do people want to share their data?), labor relations (are people prepared to undergo training?) and usability. In this context, a more apt definition is captured in the term "business process interoperability".

Interoperability can have important economic consequences, such as network externalities. If competitors' products are not interoperable (due to causes such as patents, trade secrets or coordination failures), the result may well be monopoly or market failure. For this reason, it may be prudent for user communities or governments to take steps to encourage interoperability in various situations. In the United Kingdom, for example, there is an eGovernment-based interoperability initiative called e-GIF. As far as user communities, Neutral Third Party is creating standards for business process interoperability. Another example of a neutral party is the RFC documents from the Internet Engineering Task Force (IETF).

[edit] Medical industry

New technologies are being introduced in hospitals and labs at an ever-increasing rate, and many of these innovations have the potential to interact synergistically if they can be integrated effectively. The need for “plug-and-play” interoperability – the ability to take a medical device out of its box and easily make it work with one’s other devices – has attracted great attention from both healthcare providers and industry.

Interoperability helps patients get the most out of technology, and it also encourages innovation in the industrial sphere. When different products can be combined without complicated and expensive interfaces, small companies can enter a field and make specialized products. Without interoperability, hospitals are forced to turn to large vendors that provide suites of compatible devices but that do not specialize in any one area. Interoperability promotes competition, and competition encourages innovation and quality.

From the perspective of Intel, a major producer of consumer healthcare devices, there are six major factors that affect an industry’s ability to achieve interoperability. First there needs to be a demand for interoperable products. Second, there must be standards, or rules, defining what interoperability means in the field. Third, business conditions must encourage manufacturers to make their products interoperable. Fourth, guidelines must exist that make the often-complicated standards easier for companies to interpret. Fifth, compliance must be verified by independent testing; and finally, interoperability must be actively promoted. The rapid rise of wireless technology illustrates that interoperability is attainable.

Conditions in the biomedical industry are still in the process of becoming conducive to the development of interoperable systems. A potential market of interested hospitals exists, and standards for interoperability are being developed. Nevertheless, it seems that current business conditions do not encourage manufacturers to pursue interoperability. Only sixteen to twenty percent of hospitals, for example, use electronic medical records (EMR). With such a low rate of EMR adoption, most manufacturers can get away with not investing in interoperability. In fact, not pursuing interoperability allows some of them to tout the inter-compatibility of their own products while excluding competitors. By promoting EMR adoption, companies such as Intel hope to create an environment in which hospitals will have the collective leverage to demand interoperable products.

[edit] eGovernment

Speaking from an eGovernment perspective, interoperability refers to the collaboration ability of cross-border services for citizens, businesses and public administrations. Exchanging data can be a challenge due to language barriers, different specifications of formats and varieties of categorisations. Many more hindrances can be identified.

If data is interpreted differently, collaboration is limited, takes longer and is not efficient. For instance if a citizen of country A wants to purchase land in country B, the person will be asked to submit the proper address data. Address data in both countries include: Full name details, street name and number as well as a post code. The order of the address details might vary. In the same language it is not an obstacle to order the provided address data; but across language barriers it becomes more and more difficult. If the language requires other characters it is almost impossible, if no translation tools are available.

Hence eGovernment applications need to exchange data in a semantically interoperable manner. This saves time and money and reduces sources of errors. Fields of practical use are found in every policy area, be it justice, trade or participation etc. Clear concepts of interpretation patterns are required.

Many organisations are dedicated to interoperability. All have in common that they want to push the development of the World Wide Web towards the semantic web. Some concentrate on eGovernment, eBusiness or data exchange in general. In Europe, for instance, the European Commission and its IDABC programme issue the European Interoperability Framework. They also initiated the Semantic Interoperability Centre Europe (SEMIC.EU). A European Land Information Service (EULIS) was established in 2006, as a consortium of European National Land Registers. The aim of the service is to establish a single portal through which customers are provided with access to information about individual properties, about land and property registration services, and about the associated legal environment^[2]. In the United States, the government's CORE.gov service provides a collaboration environment for component development, sharing, registration, and reuse.

[edit] Public safety

Interoperability is an important issue for law enforcement, fire fighting, EMS, and other public health and safety departments, because first responders need to be able to communicate during wide-scale emergencies. Traditionally, agencies could not exchange information because they operated widely disparate hardware that was incompatible. Agencies' information systems such as computer-aided dispatch systems (CAD) and records management systems (RMS) functioned largely in isolation, so-called "information islands." Agencies tried to bridge this isolation with inefficient, stop-gap methods while large agencies began implementing limited interoperable systems. These approaches were inadequate and the nation's lack of interoperability in the public safety realm become evident during the 9/11 attacks on the Pentagon and World Trade Center structures. Further evidence of a lack of interoperability surfaced when agencies tackled the aftermath of the Hurricane Katrina disaster.

In contrast to the overall national picture, some states, including Utah, have already made great strides forward. The Utah Highway Patrol and other departments in Utah have created a statewide data-sharing network using technology from a company based in Bountiful, Utah, FATPOT Technologies.

The Commonwealth of Virginia is one of the leading states in the United States when it comes to improving interoperability and is continually recognized as a National Best Practice by Department of Homeland Security (DHS). Virginia's proven practitioner-driven Governance Structure ensures that all the right players are involved in decision making, training & exercises, planning efforts, etc. The Interoperability Coordinator leverages a regional structure to better allocate grant funding around the Commonwealth so that all areas have an opportunity to improve communications interoperability. Virginia's strategic plan for communications is updated yearly to include new initiatives for the Commonwealth - all projects and efforts are tied to this plan, which is aligned with the National Emergency Communications Plan, authored by Department of Homeland Security's Office of Emergency Communications (OEC).

The State of Washington seeks to enhance interoperability statewide. The State Interoperability Executive Committee (SIEC), established by the legislature in 2003, works to assist emergency responder agencies (police, fire, sheriff, medical, hazmat, etc) at all levels of government (city, county, state, tribal, federal) to define interoperability for their local region.

Washington recognizes collaborating on system design and development for wireless radio systems enables emergency responder agencies to efficiently provide additional services, increase interoperability, and reduce long-term costs.

This important work saves the lives of emergency personnel and the citizens they serve.

The U.S. government is making a concerted effort to overcome the nation's lack of public safety interoperability. The Department of Homeland Security's Office for Interoperability and Compatibility (OIC) is pursuing the SAFECOM and CADIP programs, which are designed to help agencies as they integrate their CAD and other IT systems.

The OIC launched CADIP in August 2007. This project will partner the OIC with agencies in several locations, including Silicon Valley. This program will use case studies to identify the best practices and challenges associated with linking CAD systems across jurisdictional boundaries. These lessons will create the tools and resources public safety agencies can use to build interoperable CAD systems and communicate across local, state, and federal boundaries.

[edit] Achieving software interoperability

Software Interoperability is achieved through five interrelated ways:

1. Product testing

   Products produced to a common standard, or to a sub-profile thereof, depend on clarity of the standards, but there may be discrepancies in their implementations that system or unit testing may not uncover. This requires that systems formally be tested in a production scenario – as they will be finally implemented – to ensure they actually will intercommunicate as advertised, i.e. they are interoperable. Interoperable product testing is different from conformance-based product testing as conformance to a standard does not necessarily engender interoperability with another product which is also tested for conformance.

2. Product engineering

   Implements the common standard, or a sub-profile thereof, as defined by the industry/community partnerships with the specific intention of achieving interoperability with other software implementations also following the same standard or sub-profile thereof.

3. Industry/community partnership

   Industry/community partnerships, either domestic or international, sponsor standard workgroups with the purpose to define a common standard that may be used to allow software systems to intercommunicate for a defined purpose. At times an industry/community will sub-profile an existing standard produced by another organization to reduce options and thus making interoperability more achievable for implementations.

4. Common technology and IP

   The use of a common technology or IP may speed up and reduce complexity of interoperability by reducing variability between components from different sets of separately developed software products and thus allowing them to intercommunicate more readily. This technique has some of the same technical results as using a common vendor product to produce interoperability. The common technology can come through 3rd party libraries or open source developments.

5. Standard implementation

   Software interoperability requires a common agreement that is normally arrived at via a industrial, national or international standard.

Each of these has an important role in reducing variability in intercommunication software and enhancing a common understanding of the end goal to be achieved.

[edit] Interoperability as a question of power and market dominance

Interoperability tends to be regarded as an issue for experts and its implications for daily living are sometimes underrated. The European Union Microsoft competition case shows how interoperability concerns important questions of power relationships. In 2004, the European Commission found that Microsoft had abused its market power by deliberately restricting interoperability between Windows work group servers and non-Microsoft work group servers. By doing so, Microsoft was able to protect its dominant market position for work group server operating systems, the heart of corporate IT networks. Microsoft was ordered to disclose complete and accurate interface documentation, which will enable rival vendors to compete on an equal footing (“the interoperability remedy”). As of June 2005 the Commission is market testing a new proposal by Microsoft to do this, having rejected previous proposals as insufficient.

Interoperability has also surfaced in the Software patent debate in the European Parliament (June/July 2005). Critics claim that because patents on techniques required for interoperability are kept under RAND (reasonable and non discriminatory licensing) conditions, customers will have to pay license fees twice: once for the product and, in the appropriate case, once for the patent protected programme the product uses.

[edit] Railways

Railways have greater or lesser interoperability depending on conforming to standards of gauge, couplings, brakes, signalling, communications, loading gauge, operating rules, to mention a few parameters. North American railroads are highly interoperable, Europe, Asia, Africa, Central and South America, and Australia much less so. The parameter most difficult to overcome (at reasonable cost) is incompatibility of gauge, though variable gauge axle systems such as the SUW 2000 are starting to come to the rescue.

[edit] References

[edit] External links

• CIMIT - Center for Integration of Medicine and Innovative Technology - the MD PnP Program on Medical Device Interoperability
• GIC - The Greek Interoperability Centre: A Research Infrastructure for Interoperability in eGovernment and eBusiness, in SE Europe and the Mediterranean
• Simulation Interoperability Standards Organization (SISO)
• Interoperability. What is it and why should I want it. Ariadne 24 (2000)
• Interoperability Constitution - DOE's GridWise Architecture Council
• Interoperability Context-Setting Framework - DOE's GridWise Architecture Council
• Decision Maker's Interoperability Checklist - DOE's GridWise Architecture Council
• Interoperability Summit
• OA Journal on Interoperability in Business Information Systems
• University of New Hampshire Interoperability Laboratory - premier research facility on interoperability of computer networking technologies
• Microsoft Interoperability
• Understanding COM Interop
• Interoperability vs. intraoperability: your open choice on Bob Sutor blog, 6 December 2006
• i14y.net presents the research concerning the possible interoperability between JBoss Application Server, Microsoft .NET, BEA Weblogic and IBM WebSphere through the Web Services
• La France v. Apple: who’s the dadvsi in DRMs?, Nicolas Jondet (University of Edinburgh), SCRIPT-ed, December 2006
• ECIS European Committee for Interoperable Systems
• IP Crunch New ideas on interoperability and patents
• Gradmann, Stefan. INTEROPERABILITY. A key concept for large scale, persistent digital libraries.
• DL.org Digital Library Interoperability, Best Practices and Modelling Foundations

[edit] See also

• Agris: International Information System for the Agricultural Sciences and Technology
• Polytely
• Semantic Web
• Collaboration
• Identity management systems interoperability
• Norm
• Ontology (information science)
• Standard
• Standardization
• Enterprise Interoperability
• Interop V-Lab
• Isotelesis