Although many developments have been made in the design and development of learning object repositories (LORs), the efficient use of such systems is still questionable. Without realising the functional use of such systems or considering the involvement of their dynamic users, these systems would probably become obsolete. This study includes both qualitative and quantitative research methods for the investigation of prospective teachers' views on the operational aspects of such tools. The participants in this study were 75 prospective teachers that were participating in the graduate certification programme for secondary school subject teachers at Baskent University in Turkey. To realise the objectives of this study, prospective teachers were required to use the 17 of the existing LORs in their course. Analysis was also conducted on those LORs identified by the researchers. Afterwards, teachers were asked to answer an open-ended question in paper and pencil form. Through qualitative analysis, the responses of teachers were coded and presented in a table. The results of this analysis revealed many interesting points regarding teachers' thoughts on the main factors in repositories and are expected to guide the designers, developers and users of LORs to focus on the main issues related to the improvement of functionality and efficiency of such systems.