Abstract This study investigated the correlation of perceived usefulness and patronage of the Online Public Access Catalogs (OPACs) by undergraduate students in universities in South-west Nigeria. The descriptive research design of the ex post facto was adopted using a sample of 1,527 selected from the total population of 239,048 undergraduate students in the universities. A questionnaire was used to collect the data. The results revealed that most undergraduate students patronized the OPAC two to three times a week. The findings show that the perceived usefulness of the OPAC had influence on its patronage by undergraduate students in the universities (r = 0.516**, N = 1333, P < 0.05). The study concluded that perceived usefulness influenced OPAC patronage by undergraduate students in the universities. The study, therefore, recommends that the importance of the OPAC should be emphasized in the library to enhance its perceived usefulness by the students in the university libraries.

中文翻译：

---

与尼日利亚西南部大学生在线公共访问目录的赞助相关的有用性

摘要这项研究调查了尼日利亚西南部大学的本科生对在线公共访问目录（OPAC）的感知有用性和光顾的相关性。事后的描述性研究设计采用了1527个样本，这些样本选自大学中239,048名本科生的总人口。使用问卷调查收集数据。结果显示，大多数本科生每周光顾OPAC 2至3次。研究结果表明，OPAC的有用性对其大学学生的光顾产生了影响（r = 0.516 **，N = 1333，P <0.05）。该研究得出结论，认为有用性影响了大学本科生对OPAC的惠顾。因此，这项研究