A.W. Neumann 3. 2 Review service The review service manages document reviews written by library users. Figure 4 shows the editing page for reviews. Every logged-in user is allowed to submit four different reviews for each of the library's documents, one addressed to each of the three user groups(Zielgruppe the target groups of the review) and a fourth one not assigned to any user group. This offers the possibility to focus the reviews on the specific needs of the target groups. Parts of a book may be suited very well for a specific course(target group of students), while other aspect e. g. the cited literature are mostly valued by scientists. Reviews can be written and saved within the system over several sessions, only after explicitly releasing a review, it shows up in the OPAC. The user can choose for each review, if it published anonymously or under his real name. Writers are informed about guidelines for reviews, but no further checks from library staff is included in the workfow of submitting a review. Offending reviews can be reported to the library by every user. Since the writer of every review is known at least to the library, such reviews could be deleted and the writers contacted. No such case has been reported so far, although some users have deleted some of their own reviews(confer figure 3) ka. uni.karlsruhe. de. Rezensionen zum Titel. Mozilla Firefox status des Autors ch Sidemen ch Arbeiter dbkit 8 ture, and Corporate ConD 时m29地 Fig. 5. Browsing page for reviews. The author (Autor) chose to stay anonymous (XXXX)but belongs to the staff group(Mitarbeiter), the target group(Zielgruppe) students(Studenten), it has been rated(ezensionsbewertung) one time by students and two times by university staff(see stars). On the left hand side various sorting criteria(up and down) for reviews exist: reviewer(Rezensent), date(Datum), ratings (Bewertung) from the different user groups, reviewer group (Status des Rezensenten) as well as target group434 A.W. Neumann 3.2 Review Service The review service manages document reviews written by library users. Figure 4 shows the editing page for reviews. Every logged-in user is allowed to submit four different reviews for each of the library’s documents, one addressed to each of the three user groups (Zielgruppe – the target groups of the review) and a fourth one not assigned to any user group. This offers the possibility to focus the reviews on the specific needs of the target groups. Parts of a book may be suited very well for a specific course (target group of students), while other aspects e. g. the cited literature are mostly valued by scientists. Reviews can be written and saved within the system over several sessions, only after explicitly releasing a review, it shows up in the OPAC. The user can choose for each review, if it is published anonymously or under his real name. Writers are informed about guidelines for reviews, but no further checks from library staff is included in the workflow of submitting a review. Offending reviews can be reported to the library by every user. Since the writer of every review is known at least to the library, such reviews could be deleted and the writers contacted. No such case has been reported so far, although some users have deleted some of their own reviews (confer figure 3). Fig. 5. Browsing page for reviews. The author (Autor) chose to stay anonymous (XXXX) but belongs to the staff group (Mitarbeiter), the target group (Zielgruppe) is students (Studenten), it has been rated (Rezensionsbewertung) one time by students and two times by university staff (see stars). On the left hand side various sorting criteria (up and down) for reviews exist: reviewer (Rezensent), date (Datum), ratings (Bewertung) from the different user groups, reviewer group (Status des Rezensenten), as well as target group