The aim of this thesis is to evaluate a Swedish subject headings list for childrens and young adults fiction, from the perspective of consistency, and to analyze this concept's importance as a tool for measuring indexing quality. Another aim is to examine how librarians view the subject headings list as an aid for indexing fiction. The main questions are: How does the degree of consistency change when using a subject headings list for indexing fiction compared to free indexing? How does indexing change according to the facets Form/Genre, Time, Space, Matter and Person when using the list? What do consistency calculations reveal about indexing quality? How do the participants look upon the list as an aid for indexing? The empirical material consists of results from two different indexings of fiction, conducted by librarians. Consistency is calculated using Hoopers and Rollings algorithms. The results reveal that the level of consistency is marginally higher when using the subject headings list and words used for describing content are almost identically chosen from the five facet groups in the two separate indexing occasions. Further results show that calculations of consistency is an insufficient method of assessing indexing quality and finally that the librarians mainly consider the list as a useful means for indexing. The main conclusions of the study are: Subject headings lists should be completed with instructions on how to be used. The rule of only assigning indexing terms to topics appearing in more than 25% of the content, should also be used when indexing fiction. Consistency calculations should be combined with studies on indexing efficiency. The amount of words describing fiction should be limited. Some parts of the list used in this study ought to be revised and the structure of the final edition should be considered.