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The subject matter of this paper is the subject heading cataloguing of resources by librarians, authors and users. The first part contains the subject cataloguing by librarians with its significant characters. Main part of this paper represents a random analysis of subject heading cataloguing by authors of academically publications. This is an analysis of both characteristics and problems of authors' subject heading cataloguing. Following there is an overview about tagging by users.

Complexity in Political Speech in Austria [translation of the title]. Objective - The aim of this paper is to evaluate the readability and comprehensibility of written campaign messages of Austrian parliamentary parties. What is the impact of the topic, the text type and the parties´ ideological positions on the readability of those texts? Methods – TextLab, the software applied to determine text-comprehensibility, is based on the ‚Hohenheim Comprehensibility Index‘ (HIX, with 0 indicating an extremely low and 20 an extremly high comprehensibility). It statistically evaluates word- and sentence-length parameters. As a ‚readability approach‘ this method restrains to statistical parameters of the text surface exclusively: average sentence length and clause length in words, average word-length in letters as well as the percentage of words longer than six letters, sentences longer than 20 words and clauses longer than 12 words. Results and Conclusions - As anticipated there is a significant difference in readability dependent on the text type – with an HIX-value lower than 5 with party manifestos, about 10 with webtexts and close to 16 with social media messages. Concerning the topic, texts on environmental issues appear to have a slightly higher readability than those on education, but a significantly higher one than those on migration. Depending on the text type there is a clear differentiation between texts that stem from different parties. But opposed to US-American studies, which emphasize a clear positive correlation between a text´s complexity and a party´s propensity to populism or right-wing ideology, this correlation could not be confermed. When it comes to social media messages this study even shows a contrary tendency.

The increasing usage of the mobile web imposes new requirements on discovery tools of libraries. Therefore the North Rhine-Westphalian Library Center (hbz) sees the need of a mobile version of the hbz library portal "Digitale Bibliothek (DigiBib)" for the use by smartphones and tablet computers. The purpose of this master thesis is to identify the demands on a mobile version of the DigiBib with regard to functionality and content and particular emphasis on usability. The paper determines the current state of research concerning mobile web, mobile usability and mobile library applications. Furthermore, a quantitative survey was conducted with DigiBib users. The results show that a mobile DigiBib would be used predominantly by Android or iOS smartphones. The most important use case is the known item search, closely followed by the subject search. A single search box as well as multiple search boxes should be provided. Important usability requirements are the reduction of text input, which can be achieved through default and automatic completion of search terms as well as possibilities of data export. The availability check should contain a site-specific localization of libraries possessing the desired title. Also interlibrary loan is relevant for the mobile use of the DigiBib. Less important are links to databases and e-journals. Due to limited resources and in order to create platform independence, the mobile DigiBib should be developed as a web application.

Access to "public sector information" is a broadly discussed topic at the moment, as current publications like the "green book on public sector information in the information society" compiled by the European Union and a number of recent conferences dealing with this topic show. Legal information plays a special role within this field, as it is the prerequisite to obeying the law and to exercising one's rights and duties as a citizen. The paper deals with the Austrian legal information system "Rechtsinformationssystem" (RIS) as an example of public sector information and its commercial opponent "Rechtsdatenbank" (RDB). It uses data gathered by a literature review and interviews with experts. One member of a non-governmental organization, one representative of the federal agency providing the RIS, the head of a group representing the information industry's interests, a representative of the Austrian bar association and the managing director of the RDB, a Vienna-based company selling legal information, were consulted. The dissertation has sought arguments that support or vitiate the following hypotheses: 1. Non-restrictive access to legal information is necessary for legal and democratic/political reasons. 2. The existing Austrian legal information system "RIS" has to be complemented by legal advise supplied by qualified persons familiar with law and jurisdiction. 3. Free-of-charge basic information, provided by the government, and commercial added-value services can coexist – under certain circumstances. Supporting arguments for the hypotheses 1 and 2 could be found. The assessment of the third hypothesis depends on current market developments and cannot be undertaken yet.