A B S T R A C T
As the world becomes increasingly complex, the demand for individuals with strong general reasoning abilities has never been more important. To meet this demand, educators and employers need a reliable way to measure the general reasoning ability of their students and employees. The Test of General Reasoning Ability (TOGRA) has emerged as a promising tool for measuring general reasoning ability. However, it has not been used in developing nations like Africa, including Nigeria. One possible reason for this is the lack of revalidation of the TOGRA in Nigeria. Therefore, to gain recognition in Nigeria’s research community and also be used with confidence, it is necessary to revalidate the test in the local context. This prompted the study. Eight research questions were drawn, a triangulation research design was adopted, and a sample of 400 persons was drawn using a multi-stage sampling approach from the Port Harcourt metropolis in Rivers State, Nigeria. Two instruments were used for data collection: the Test of General Reasoning Ability (TOGRA) and the Reynold Adaptable Intelligence Test Nonverbal (RAIT-NV). The data were analysed using various statistical tools and software. Results revealed that TOGRA possesses adequate difficulty and discrimination indices, high-reliability indices, and validity. The conclusion was that TOGRA is a reliable and valid measure of reasoning ability in Nigeria. It was recommended that it be used for research and practical purposes in educational and occupational settings.