Introduction Postgraduate completion rates in higher education institutions in Southern Africa, particularly in South Africa and Zambia, have become a pressing concern for both academia and policymakers. Persistent challenges such as high attrition rates, extended periods to graduation, and inconsistent supervisory quality directly impact the effectiveness and reputation of postgraduate programmes. As institutional leaders continue to grapple with enhancing graduates’ quality and throughput, attention has increasingly turned to the vital role of supervision in shaping student outcomes. Methodology This study employs a mixed-methods approach guided by a pragmatic research paradigm that combines quantitative surveys and institutional data analysis with qualitative interviews. The quantitative element measured completion rates, study durations, and dropout frequencies, while the qualitative component delved into the lived experiences of graduates, specifically exploring perceptions of supervisory support, the frequency and quality of feedback, and institutional resources. Participants included graduates from selected public universities in South Africa and Zambia, who had completed their master’s or doctoral programmes within the last five years. Results The findings indicate a strong positive relationship between high-quality supervision and increased likelihood of timely graduate completion. Common attributes of effective supervision include regular engagement, constructive and timely feedback, and supervisors’ genuine interest in student progress. Conversely, inadequate supervision, manifested by infrequent contact, ambiguous guidance, or resource constraints, was associated with delays and a higher risk of dropout. Institutional support structures, mentorship schemes, and manageable supervisor workloads have emerged as significant enablers of successful student outcome. Conclusion The quality of postgraduate supervision is pivotal in determining the completion rates in higher education institutions in South Africa and Zambia. Improving supervisory practices, coupled with robust institutional support, can not only enhance student experiences, but also contribute to higher retention and graduation rates, thereby advancing the goals of postgraduate education in the region.
N.N. et al. (Wed,) studied this question.