Methodological Evaluation of Municipal Water Systems in South Africa Using Difference-in-Differences for Cost-Effectiveness Analysis,

This study addresses a current research gap in Agriculture concerning Methodological evaluation of municipal water systems systems in South Africa: difference-in-differences model for measuring cost-effectiveness in South Africa. The objective is to formulate a rigorous model, state verifiable assumptions, and derive results with direct analytical or practical implications. A mixed-methods design was used, combining survey and interview data collected over the study period. The results establish bounded error under perturbation, a convergent estimation process under stated assumptions, and a stable link between the proposed metric and observed outcomes. The findings provide a reproducible analytical basis for subsequent theoretical and applied extensions. Stakeholders should prioritise inclusive, locally grounded strategies and improve data transparency. Methodological evaluation of municipal water systems systems in South Africa: difference-in-differences model for measuring cost-effectiveness, South Africa, Africa, Agriculture, longitudinal study This work contributes a formal specification, transparent assumptions, and mathematically interpretable claims. The empirical specification follows Y=₀+^ X+, and inference is reported with uncertainty-aware statistical criteria.