Management in Water sector
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Yohana Msangula, Ezrael Massawe, Christopher Nditi
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30 June 2026
14
16
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Volume 3 Issue 1
Page 1 - 13
An Empirical Study on Success Factors for the Design and Build Approach in Tanzania’s Water Sector
DOI:
https://doi.org/10.56542/wi.jwempo.v3.i1.a3.2026
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Keywords:
Project delivery methods; Relative Importance Index; Inter-Rater Reliability; Design and Build; Water Supply Projects; Critical Success Factors; Tanzania
Abstract
The Design and Build method has become increasingly adopted in Tanzania’s water supply projects, yet the role and contribution of local contractors remain uncertain. The study aimed to assess the critical success factors influencing the Design and Build method in Tanzania’s water supply projects, with a focus on perspectives from DAWASA and local contractors. The study employed the Relative Importance Index (RII) analysis and the Inter-Rate Reliability agreement test. The findings show that a Well-defined Project Scope (RII = 0.99, Rank 1) is the most influential factor, followed by Timely Payment (RII = 0.93, Rank 2), skilled workforce (RII = 0.90, Rank 3), Stable Leadership (RII=0.89, Rank 4), and Fast Approval Processes (RII = 0.80, Rank 5). These results emphasize the necessity of clear project planning, efficient financial management, and strong institutional support. ICC analysis further revealed consistent agreement among respondents; the ICC scores were Administrative Factors (ICC value of 0.92), Design-related Factors (ICC value of 0.791), Technical Factors (ICC value of 0.71), Regulatory Factors (ICC value of 0.689), and Financial Factors (ICC Value of 0.648). This indicates there are similar views about the importance of structured project scope, timely fund release, and effective leadership as key drivers for a successful project.
