Ample literature on the retention of undergraduate students is available. However, information on the retention of postgraduate students in doctoral research is not abundant, especially when the population comprises working adult students studying on a part-time basis. This article aims to explore factors that influence retention in this group of students. The literature identified various factors that could affect the retention of these students. Besides the academic and social integration identified by Tinto, environmental factors (finances, family and employment) and time constraints also play a role in their persistence. The data was collected from PhD students at a Business School in South Africa. The results from the survey confirm the influence of these factors on retention. The inclusion of qualitative responses as part of the survey led to recommendations that consider the finer nuances of the support needed by this group of heterogeneous students.