The purpose of this research was to examine how social issues are perceived and addressed in the food and drink sector, focusing on the narrower context of Nigerian purchasing practices, identifying the drivers, and barriers to the adoption of socially responsible purchasing (SRP) in the organisational supply chains. This research is underpinned by the stakeholder and institutional theories with the use of Carroll's CSR pyramid to explain the perceptions of stakeholders and the level at which each of the practices is in the pyramid. An in-depth study was conducted in multinational and indigenous food and drink organisations in Nigeria. Data was gathered from practitioners comprising of employees, managers, and executives by means of questionnaires and semi-structured face-to-face interviews to triangulate data sources. Drawing on the data collected, respondents' perspective of the meaning of socially responsible purchasing provided new insights into the phenomenon with various meanings and contestations. The findings suggest that socially responsible purchasing practices have a moderate positive influence on the organisations' supply chains within an unstable economic environment. Some of the practices were perceived to be voluntary and having an ethical underpinning while others were related to legal responsibilities. The findings suggest that the moderate influence is due to internal and external factors within the institutional environment. This research context was restricted to private organisations in the food and drink sector in Nigeria which might limit the generalisation of the findings. However, the findings may be transferable to other sectors of the economy where socially responsible purchasing issues are addressed in the supply chains. In practice, SRP is perceived to be an important element of CSR and supply chains despite the barriers to its implementation. The practices should be properly implemented to help in the sustenance of organisational supply chains. This research will be insightful for other industrial sectors as well as developing economies in Africa. The findings advance the stakeholder and institutional theories by providing an in-depth perception of various stakeholders and SRP practices within the institutional environment of organisations' supply chains. The research has contributed to enriching the literature on CSR and supply chains sustainability in Nigeria which has a relative shortage of literature on CSR and supply chain.

Background: Since the 1960s, the notion of sustainability has gained worldwide significance, including environmental issues, and advocating for sustainable economic development. Businesses have a crucial role in reducing environmental effects, motivated by pressure from stakeholders such as governments and shareholders. While environmental and economic sustainability receive significant attention, the social aspect often receives less attention. Social sustainability involves creating equitable social systems and ensuring ethical practices, employee well-being, and diversity. Sustainability Consultancy Companies (SCCs) assist firms in integrating sustainability into their daily operations. Nevertheless, SCCs must comply with social sustainability principles, ensuring that they implement the same values they advocate for to maintain their reputation and establish industry benchmarks.   Purpose: The purpose of this research is to determine the extent to which Sustainability Consulting Companies (SCCs) are implementing sustainable practices within their daily operations.  We are investigating whether SCCs possess the necessary knowledge, expertise, and in-depth understanding of issues related to social sustainability practices. Our research aims to provide practitioners with knowledge and awareness of how SCCs perceive social sustainability and to what extent they implement social sustainability practices.    Method: This thesis employed a qualitative research approach, incorporating relevant literature, peer-reviewed articles, and semi-structured interviews. Through the semi-structured interviews conducted with various Sustainability Consultancy Companies (SCCs), employees, and a CEO, we were able to gather varying perspectives and professional insights on social sustainability issues.   Conclusion: The findings of this research indicate that although most SCCs had knowledge on social sustainability issues and practices, only a limited number of levels in Carroll’s CSR Pyramid were fulfilled. Furthermore, while the SCCs consider social sustainability as the missing pillar, there is a limited focus on implementing social sustainability in comparison to the other pillars of sustainability.