Purpose The aim of quality assessment is to support the development of learners’ competencies as required in 21st century economies. This paper aims to analyse the role and understanding of heads of department (HoDs) regarding quality assessment and the moderation of school-based assessment (SBA) tasks in tourism, which is a subject in the secondary school curriculum. Design/methodology/approach To elicit valid findings in this interpretative study, focus group discussions were conducted with 16 participants. The HoDs who participated in this study were purposively sampled based on their role as managers of tourism in their respective schools. Findings Informed by the context, input, process and output theoretical model, this study identified various elements that impacted the enactment of HoDs’ role in the moderation of SBA tasks, with particular reference to tourism. Despite these HoDs’ understanding of the importance of moderation as a key aspect in assuring quality assessment practices, it was found that the moderation of tourism SBA tasks was generally not conducted meticulously and appropriately. Research limitations/implications The qualitative case study on which this paper is based used a limited sample within a restricted timeframe and the results may thus not be generalised. However, the methodology produced trustworthy results and may thus be replicated and extended to other subjects with a practical component for enhanced insights into SBA practices. Practical implications This paper highlights the necessity for schools to rely on knowledgeable and principled curriculum leaders, particularly HoDs, for the effective management of assessment and moderation strategies to ensure quality outcomes. The qualitative case study on which this paper is based used a limited sample within a restricted timeframe, and the results may thus not be generalised. However, the methodology produced trustworthy results and may thus be replicated and extended to other subjects with a practical component for enhanced insights into SBA practices. Originality/value This paper contributes to the discourse on quality assurance and SBA, with particular focus on how quality assessment can be enhanced in the moderation process of tourism. The insights that this paper share may contribute to improved policy decisions regarding the SBA process in tourism.