SEARCH. FIND. MAKE AN IMPACT.
For three decades, the Karlsruhe Virtual Catalog has been linking library catalogs worldwide and making scholarly collections searchable—from current publications to older editions, gray literature, and special collections. As a publicly funded and quality-assured infrastructure, it provides a reliable foundation for research and the availability of media.
How did the KVK come about? How is it used? And what role does it play today?
Voices, insights, statistics, and stories from three decades of research practice offer a glimpse behind the scenes of a platform that many have long taken for granted.
The year is 1996:
Every library has its own catalog.
If you search, you’ll find something—but often only part of what you’re looking for.
The rest? It’s hidden somewhere out there.
At the KIT Library, people think to themselves: There’s got to be an easier way …
The solution: search multiple catalogs at once—without having to collect them.
The KVK simply checks everywhere.
One search, many results.
And suddenly, hits appear that no one expected.
More and more libraries are joining in, and more and more catalogs are becoming accessible.
The KVK is making its mark—first regionally, then far beyond.
What started as a good idea is turning into a tool that people wouldn't want to be without.
Technology continues to evolve, and so do user interfaces.
But the idea remains surprisingly consistent: it’s better to search thoroughly once than to search ten times separately.
It’s worked for 30 years—and will almost certainly continue to do so in the future.
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Indispensable since 1996 ...
To mark the 30th anniversary of the Karlsruhe Virtual Catalog, a survey was launched directly among its users. The response rate was significantly higher than expected—as was the positive feedback.
An analysis of the 860 re-registrations paints a clear picture of usage frequency:
- 58% use the KVK regularly
- 21% use it daily
- 19% access it occasionally
- 0.6% have just discovered the KVK
A result that naturally makes the KIT Library’s IT team especially happy!
... and that's what the KVK is used for
In addition to frequency of use, respondents were also asked what tasks they currently perform using the KVK. Multiple responses were allowed. The feedback clearly shows what the catalog is most frequently used for:
- 646 re-registrations were for searching for a specific title
- 422 people use the KVK to check the availability of a work
- 253 respondents use it to conduct thematic research, including across national borders
- 173 check the possibility of an interlibrary loan
- 47 use the KVK simply to browse
Thus, the survey shows not only how often the KVK is used, but also for what purposes, and why it has maintained its firm place in research practice for three decades.
Uwe Dierolf
As IT Director of the KIT Library, Uwe Dierolf has been shaping the KVK’s technical infrastructure from the very beginning since 1996. A computer scientist, he is a creative thinker, brimming with ideas and passionate about discovering and implementing new solutions. In addition to developing and maintaining web services and databases, he and his team ensure that the KVK functions as a reliable, user-oriented platform.
Michael Mönnich
As a librarian and a key contributor to numerous IT projects at the KIT Library, Michael Mönnich was one of the initiators of the Karlsruhe Virtual Catalog in 1996. After completing his studies and earning his doctorate in pharmacy and the history of pharmacy, he joined the senior library service in 1989 and worked at the KIT Library until 2023, most recently as deputy director and head of user services.
Roland Sand
As a computer science student in the mid-1990s, Roland Sand applied for a student's project at the Karlsruhe University Library titled “Development of a Meta-Search Interface for WWW Library Catalogs.” He played a key role in the planning and technical implementation of central components of the KVK.
Today, the software developer works for an IT service provider in Karlsruhe.
For 30 years, the Karlsruhe Virtual Catalog has been bringing people and knowledge together around the world. It’s time to look back, celebrate a little, and show just how vibrant and indispensable this idea remains to this day.
"State of the Art" or Already a "Digital Classic"?
To mark this anniversary, we’re taking a closer look at this question. With a look back, a survey of users, and selected testimonials, we’ll show what the KVK is today.
… a national and international catalog of holdings, and thus my first stop when I’m doing research beyond my own library. A THOUSAND THANKS to KIT for this initiative! It’s been my No. 1 for 30 years.
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In its April 7 issue, “Die Rheinpfalz” reports on the Karlsruhe Virtual Catalog (KVK). The article by Andreas Lapos shows how the catalog continues to provide access to several hundred million items in numerous national and international catalogs, making it an indispensable tool for research and study.
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646 re-registrations were for searches for a specific title.
(Multiple responses were allowed)
For 30 years, the KVK has been a reliable, publicly funded search infrastructure for scholarly research. It aggregates international catalogs, indexes diverse collections, and provides structured data and availability information via open interfaces.
422 people used the KVK to check the availability of a work. (Multiple responses were allowed.)
... a fabulous research tool. As a music historian and former librarian, I am sometimes asked to write essays or articles for program booklets—and the KVK is a great resource for tracking down the occasional title and then ordering it from the LVK.
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The "Worldwide" section has now grown to include over 30 catalogs, thereby expanding the international search options.
173 are exploring the possibility of interlibrary loan. (Multiple responses were allowed.)
… *the* go-to tool for bibliographic research—congratulations on your 30th anniversary, and thank you for your great work!
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The KVK now includes 84 bibliographic databases worldwide that can be searched simultaneously.
253 respondents use it to conduct thematic research, even across national borders. (Multiple responses were allowed.)
The new K10plus mega-network (a merger of the Southwest German Library Network (SWB) and the Joint Library Network (GBV)) is being integrated. The KVK is adapting its interfaces to efficiently query the network’s more than 200 million records.
Research literature on a topic—including international sources.
The Virtual German National Bibliography (VDL) will be added as a standalone search option on the KVK homepage in June. In September, the option for the Virtual Catalog of Theology and the Church (VThK) will follow, enabling targeted searches of church collections.
This marks the first time that virtual catalogs have been integrated into the Karlsruhe Virtual Catalog.
... indispensable. I'm conducting research on children's and young adult literature from 1933 to 1945. Some works are extremely hard to find, and the KVK has often provided important information in this regard.
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The BibTip recommender system is being integrated; it operates across the boundaries of individual library consortia and links titles from various sources. The ISBN already identified from the full-title display with cover image serves as the basis for generating recommendations. BibTip draws on an existing recommendation system that is continuously expanded through its integration into numerous library and network catalogs. Thematic recommendations appear directly in the KVK’s short and full-title displays.
…an indispensable tool that would have to be invented quickly if it didn't already exist!
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The announcement that the KVK would be shut down—which was revealed to be an April Fools' Day prank—generated a huge response—and some startled reactions that some people still remember to this day.
Sorry again for the scare :-)
The KVK's search form and results pages are being converted to responsive web design. This means the service can now also be used on smartphones and tablets—even though many target systems still do not display their full titles in a mobile-optimized format.
... the best research tool for my work—without it, everything would be sooo much more tedious; this way, I can quickly get a lot of information at a glance!
You made my day!
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Full title pages are displayed directly in the KVK, including automatically added cover images. Using the “view-title.php” script, the system loads the title page internally, identifies the ISBN, and adds the appropriate covers.
Many catalogs do not yet offer this feature themselves—the KVK fills this gap and enhances its infrastructure with visible added value.
Use the KVK every day.
47 people use the KVK just to browse around. (Multiple responses were allowed)
The KVK is introducing a free-text search feature, thereby responding to the requests of many users for a simple search bar, similar to the one made popular by Google.
In addition to expanded statistical functions for project partners, multilingual support was introduced. Custom text modules and templates allowed for the targeted customization of customer-specific search results.
For projects such as VDL, the KVK was also opened up to any search attributes and further developed technically. Session limits and the reuse of existing sessions reduced the load on the target systems and prevented unnecessary resource consumption in the union catalogs.
... a very useful tool, albeit one with its pitfalls: For example, some catalogs often report that they are blocked. It is surprising that the fundamental need for a global federated search has persisted.
While the name “WorldCat” suggests more, the KVK offers far greater practical value for locating library holdings.
It’s gratifying that it exists, and if it didn’t, we’d have to invent it. Its impressive 30-year history is certainly reason enough to extend heartfelt birthday wishes and congratulations to the KIT Library as its inventor, developer, and operator.
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The Karlsruhe Virtual Catalog goes online. Since then, billions of search queries have been sent from Karlsruhe to library and union catalogs worldwide, analyzed, and made available in a standardized format.