This study examines the reliability and comparability of objective and subjective measures of performance for international joint ventures (IJVs). The research explores the relationships between these measures and the effectiveness of different data collection methods. The study tests five hypotheses regarding the correlation between objective and subjective performance measures, the consistency of assessments among multiple respondents, and the influence of national culture on performance evaluations. International joint ventures involve two or more legally distinct organizations that share decision-making responsibilities. The study finds that objective measures such as IJV survival, stability, and duration are positively correlated with subjective performance measures. These correlations are strongest for general dimensions of performance, such as overall satisfaction and sales level, but weaker for more specific dimensions like quality control and cost control. The study also finds that assessments by the IJV general manager (IJVGM) are more consistent with those of individual parent firms than the assessments of the parent firms themselves. The study further examines the influence of national culture on performance evaluations. It finds that IJVs involving parents from similar national cultures tend to have stronger correlations between partners' assessments of performance. This suggests that cultural similarity may enhance agreement among partners regarding the performance of the IJV. The study uses data from two samples: one focusing on U.S. IJVs and another on Canadian IJVs. The U.S. sample includes IJVs that have ceased operations, while the Canadian sample includes only IJVs that are still active. The study finds that objective performance measures are more reliable for the U.S. sample, while the Canadian sample lacks sufficient data for objective measures due to the sampling constraints. Overall, the study supports the five hypotheses tested, showing that objective and subjective performance measures are generally positively correlated, and that data collected from multiple respondents is more reliable. The study also highlights the importance of considering cultural similarity in performance evaluations and the need for alternative explanations when interpreting IJV performance. The findings suggest that while objective measures are useful, subjective measures can also provide valuable insights into the performance of IJVs.This study examines the reliability and comparability of objective and subjective measures of performance for international joint ventures (IJVs). The research explores the relationships between these measures and the effectiveness of different data collection methods. The study tests five hypotheses regarding the correlation between objective and subjective performance measures, the consistency of assessments among multiple respondents, and the influence of national culture on performance evaluations. International joint ventures involve two or more legally distinct organizations that share decision-making responsibilities. The study finds that objective measures such as IJV survival, stability, and duration are positively correlated with subjective performance measures. These correlations are strongest for general dimensions of performance, such as overall satisfaction and sales level, but weaker for more specific dimensions like quality control and cost control. The study also finds that assessments by the IJV general manager (IJVGM) are more consistent with those of individual parent firms than the assessments of the parent firms themselves. The study further examines the influence of national culture on performance evaluations. It finds that IJVs involving parents from similar national cultures tend to have stronger correlations between partners' assessments of performance. This suggests that cultural similarity may enhance agreement among partners regarding the performance of the IJV. The study uses data from two samples: one focusing on U.S. IJVs and another on Canadian IJVs. The U.S. sample includes IJVs that have ceased operations, while the Canadian sample includes only IJVs that are still active. The study finds that objective performance measures are more reliable for the U.S. sample, while the Canadian sample lacks sufficient data for objective measures due to the sampling constraints. Overall, the study supports the five hypotheses tested, showing that objective and subjective performance measures are generally positively correlated, and that data collected from multiple respondents is more reliable. The study also highlights the importance of considering cultural similarity in performance evaluations and the need for alternative explanations when interpreting IJV performance. The findings suggest that while objective measures are useful, subjective measures can also provide valuable insights into the performance of IJVs.