During the development of FRBRized prototype OPACs in the recent decade it seems that the user has gradually been ignored. Users views toward the collocation function in bibliographic families and their understanding of FRBR entities are vital for the development of user-centered OPACs. Although most of the OPAC users are not familiar with FRBR concepts and terminology, they have the ability to define and realize relations among bibliographic entities. This paper reports the process of applying quantitative and qualitative methods simultaneously in order to align users\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\' views on bibliographic families with the FRBR\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'s entities. It focuses on how and the extent to which each method contributed to the findings of the study. For this purpose two sets of 40 bibliographic cards [records] which were prepared based on the FRBR model were given to 60 highly-specialized professionals in fields of the \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\"Koran\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\" and the \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\"Epic of Kings\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\" for categorization. A complementary questionnaire was also distributed among these participants for measuring the importance of each FRBR entity. During the information gathering sessions, a semi-structured interview was conducted to gather qualitative information from the research population. The findings of this research shows that how mixing the information gathered through questionnaire and cards along with the interviews lead to more realistic findings about the validity of FRBR levels of entities: works, expressions, manifestations and items.

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