The purpose of this study is to identify what fields are used to decide how to proceed to the next screen and what factors affect the selection of the fields used on the online catalog system. The initial search option chosen by the users differed statistically according to the type of online catalog system used and the type of query. However, the type of user did not affect the choices of the initial search option. On the citation list screen, the title field was the most frequently used to move to the citation screen. On the citation screen, also, the title field was the most frequently used for confirming a retrieved citation.