Process-control systems (PCSs) are employed in various engineering applications to manage processes efficiently. In Ethiopia, PCSs have been introduced to improve coastal engineering practices, but their effectiveness and adoption rates remain uncertain. A quasi-experimental design was employed, including pre- and post-intervention data collection through surveys and interviews. The analysis utilised regression discontinuity designs (RDD) to estimate treatment effects on adoption rates. The proportion of project managers who adopted PCSs increased from 30% in the control group to 45% in the intervention group, with a confidence interval of ±3 percentage points. This study provides evidence that PCSs can be effectively implemented and adopted in coastal engineering projects in Ethiopia, offering insights for future policy development. The findings suggest that targeted training programmes should be developed to enhance the adoption rates of PCSs among project managers in Ethiopia. The maintenance outcome was modelled as $Y_{it}=\beta_0+\beta_1X_{it}+u_i+\varepsilon_{it}$, with robustness checked using heteroskedasticity-consistent errors.