LiU Subject Classifier 2025

This web service gives you suggestions for relevant research subjects based on an automated text analysis of an abstract and/or ISSN

More information about the service

Standard for the Swedish classification of research

The Swedish Higher Education Authority (UKÄ) and Statistics Sweden (SCB) have developed a standard for the Swedish classification of research subjects (SSIF). According to this standard, research is classified in three hierarchical levels. The first two levels (research subject area and research subject group) are identical to the OECD subject classes from Fields of Research and Development, pp. 57-59. The third level subjects are developed by UKÄ and Statistics Sweden. The current version (SSIF 2025) consists of 297 subjects and applies to publications that are registered at institutional repositories (such as DiVA) as of January 2025. Read more here (Swedish).

Background

The underlaying data for LiU Subject Classifier are publications from SwePub, classified according to the previous version of the standard (SSIF 2011). The data consists of approximately 600,000 abstracts. The service converts the subjects to the recent standard (SSIF 2025), based on the code key published by UKÄ/Statistics Sweden. If you get a suggestion of a subject within a research subject group where new subjects have been added, you will also get a list of them. Since you can get hits on topics within the same subject group, the lists of new topics can appear several times in the results. More information and code key can be found at UKÄ. Download the code key.

Instructions

To find a subject area for a publication, copy the abstract into the appropriate box. If the publication is published in a journal, you may also enter the ISSN (either of print or electronic, in the following format XXXX-XXXX).

Language

When you paste an abstract into the box below, the language will automatically be identified.

Presentation of results

The results are presented as a list of up to five matching subjects (besides suggestions for new topics within the research subject group). The list may be a little longer if subjects have been splitted in the latest revision.

  • If you have entered only an abstract, the words in your abstract will be compared with the words in the underlaying data. The best matching subjects are listed.
  • If you have entered only an ISSN, the most frequently occurring subjects of that journal/series are listed. To get a result, the journal/series must be included in the underlaying data.
  • If you have entered both an ISSN and an abstract, the list is limited to the most frequent subjects of the journal/series and sorted according to the matches of your abstract.

The results are sorted according to a score, which is a measure on how well the subject matches with your abstract. However, the score is not shown in the results.

You can read more about the service here.

Let us know what you think

Any positive and negative feedback is welcome to ep@ep.liu.se. Please include the abstract and/or ISSN you have entered and the result you expected.

Paste your text here:


ISSN:


Some tips!

  1. When you classify a publication, you can use one or more suitable subjects (level 3) to describe the publication's content.
  2. If you use more than one subject, list them in order of priority and do not choose subjects within more than three different subject groups (level 2).
  3. Interdisciplinary research is classified within the subject or subjects that mainly describes the content of the publication. Within Humanities the subject 60504 “Interdisciplinary Studies in Humanities and Arts” can be used.
  4. If no suitable subject is found, as a last resort you can use the subjects begin with Other.l. These are found in most subject groups and have codes ending with "99". For example, 20599 Other Materials Engineering within the subject group 205 Materials Engineering.


Result: