{ "background": "Municipal infrastructure asset management in sub-Saharan Africa is often hampered by inefficient data collection and valuation systems, leading to suboptimal resource allocation and maintenance yields. Existing methodologies frequently lack rigorous field validation, particularly within the region's specific operational and environmental contexts.", "purpose and objectives": "This case study aimed to methodologically evaluate a novel, technology-assisted asset auditing system and quantify its impact on the financial yield derived from municipal infrastructure portfolios. The primary objective was to determine the efficacy of the proposed system against conventional practice through a randomised field trial.", "methodology": "A randomised controlled trial was implemented across multiple municipalities. Treatment groups applied a structured digital auditing protocol incorporating spatial mapping and condition indexing, while control groups continued with established manual methods. Yield was measured as recovered revenue per asset. The treatment effect was estimated using a linear regression model: $Yi = \\beta0 + \\beta1 Ti + \\mathbf{X}i\\boldsymbol{\\beta} + \\epsiloni$, where $Yi$ is the yield, $Ti$ is the treatment indicator, and $\\mathbf{X}_i$ is a vector of control variables. Robust standard errors were clustered at the municipal level.", "findings": "The intervention generated a statistically significant positive effect on yield. Municipalities employing the new system achieved a mean yield improvement of 17.3% (95% CI: 12.1% to 22.5%) compared to the control group. The precision of asset condition data was notably enhanced, directly informing targeted maintenance investments.", "conclusion": "The randomised trial demonstrates that structured, technology-enhanced methodological approaches can substantially improve the financial performance of municipal infrastructure asset systems in a West African context.", "recommendations": "Municipal authorities should integrate digital auditing and spatial data management into core asset management procedures. Further research should investigate the longitudinal sustainability of yield gains and the system's applicability to other infrastructure classes.", "key words": "asset management, infrastructure, field experiment, municipal engineering, yield