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This research examines the critical role of supplier collaboration in advancing sustainable procurement practices within Temeke District’s Blue Economy a coastal zone in Tanzania where marine resources underpin livelihoods yet face escalating environmental pressures. Despite national policies promoting sustainable ocean governance, implementation gaps persist due to fragmented regulations, power imbalances, and the marginalization of informal suppliers. This study addresses an underexplored link: how collaborative relationships between buyers and suppliers enable or constrain sustainability outcomes in complex, resource-dependent contexts. Adopting a mixed methods approach, the research engaged diverse stakeholders across public, private, and community spheres. Findings reveal that transactional procurement paradigms dominate, stifling innovation and ecological stewardship. Trust deficits and restrictive contractual frameworks inhibit meaningful partnerships, while pervasive informality excludes suppliers with invaluable place-based knowledge. Nevertheless, intermediary actors, such as NGOs and community leaders emerge as vital bridges, fostering adaptive solutions through locally embedded dialogue. The study identifies key barriers, including conflicting sectoral policies, financial exclusion, and gendered occupational segregation, which limit inclusive participation. Conversely, enablers like co-designed "Sustainability Compacts" and intergenerational knowledge exchange offer pathways for reform. Recommendations prioritize integrated governance, supplier empowerment funds, and gender-responsive platforms to reconfigure collaboration as a catalyst for equity and resilience. By centering Temeke’s socio-ecological realities, this research contributes a framework for transforming procurement from a compliance exercise into a regenerative force. It argues that effective Blue Economy transitions require redistributing agency to frontline suppliers not as contractors, but as custodians of coastal futures.

This study aimed to examine the factors that affect the procurement performance of Tanzania’s parastatal entities. It examined the impact of political interference and staff competency on procurement performance. The questionnaire was used to collect data from heads of departments from 93 state-owned organizations in the Dar es Salaam Region as part of an explanatory research approach. The sample of 258 respondents was randomly selected from the population of 712 heads of departments. However, 241 questionnaires were collected from the respondents. The data were descriptively evaluated to establish the mean and standard deviation. The data were compiled using frequency distribution tables before being analyzed using multiple regression analysis. This study shows that political interference has a negative influence on procurement performance, whereas staff competency has a positive impact on procurement performance. The study implied that political influence in the procurement process should be avoided to the greatest extent possible because of its adverse effects and that staff competency should be stressed to give staff members the new skills and competencies needed to solve procurement difficulties.

The study aimed to examine the effect of political interference on procurement performance in Tanzania's parastatal organization. It was specifically intended to investigate the impact of political interference on the contract award, project allocation, and legal framework implementation on procurement performance and make some recommendations for improvement. The data were collected from heads of departments at 93 parastatal organizations in Dar es Salaam using structured questionnaires. The study's population consisted of 712 respondents, with a sample size of 256 randomly selected, but only 241 questionnaires were returned, completed, and used for analysis. The data were descriptively and inferentially analyzed using a multiple regression analysis with the help of SPSS version 26. The finding shows that political interference in contract award and legal framework implementation negatively influences procurement performance. In contrast, political interference in project allocation positively impacts procurement performance. The study implied that the procuring entity should ensure that politicians were not involved in the procurement process and that only authorized officers were allowed to participate.

The current study examined the impact of financial aspects in achieving sustainable public procurement at the Zanzibar Urban Services Project. To achieve this objective, the study used a questionnaire and documentary review checklist to collect data on identifying the impact of financial aspects on sustainable public procurement. The study used a case study design using Zanzibar Urban Services Project. Both primary and secondary data were collected through questionnaires and documentary reviews. The researcher employed the probability sampling technique specifically stratified sampling technique to sample 107 out of 153 individuals from the field and content analysis for documentary review. Descriptive analysis was used to analyse preliminary data and lastly multiple regression analysis modals was used to measure the relationship among variables. Study results indicated that in spite of the contribution of financial aspects in procurement, there is a challenge of undermining the emphasis of other non-financial aspects in procurement procedures. It was also confirmed that there is a need of balancing between financial, social and environmental aspects which are argued to achieve sustainable public procurement.

This paper presents the structure and contexts of transaction costs and competitive tendering. The model is proposed as the first step in the development of a causal link between transaction costs and competitive tendering in the public sector. It draws upon the theory of open systems to build a structural framework. Concepts relevant to transaction costs and competitive tendering in the public sector are integrated into this framework. The subsequent papers will add concepts to the model and demonstrate a generic model fit for public practitioners, decision-makers, academicians, and bidders (suppliers, contractors, and service providers) to carry out their procurement activities in a systematic and planned manner.