{ "background": "Community health centres in sub-Saharan Africa face persistent systemic inefficiencies, yet validated diagnostic tools for identifying specific operational bottlenecks are scarce. Existing assessments often lack the granularity required for targeted intervention.", "purpose and objectives": "This study aimed to empirically evaluate a novel diagnostic framework designed to identify and rectify operational inefficiencies within community-based healthcare delivery systems. The primary objective was to measure its impact on process efficiency metrics.", "methodology": "We conducted a randomised field trial involving 42 community health centres. Centres were randomly allocated to an intervention group, receiving the structured diagnostic assessment and a tailored implementation plan, or a control group continuing standard operations. Efficiency was measured via a composite score derived from patient flow times, resource utilisation rates, and administrative task completion. The primary analysis used a linear mixed-effects model: $Y{ij} = \\beta0 + \\beta1 Ti + uj + \\epsilon{ij}$, where $Ti$ is the treatment indicator and $uj$ is a centre-level random effect. Robust standard errors were calculated.", "findings": "Centres receiving the intervention demonstrated a significant improvement in the composite efficiency score (adjusted mean difference: 0.38, 95% CI: 0.12 to 0.64). The most pronounced gain was a 22% reduction in median patient waiting time post-intervention compared to control centres.", "conclusion": "The application of a structured diagnostic framework led to measurable efficiency gains in community health centre operations, confirming its utility as a practical management tool.", "recommendations": "Health system managers should integrate structured diagnostic assessments into routine operational audits. Further research should investigate the framework's cost-effectiveness and adaptability to other primary care contexts.", "key words": "health systems strengthening, operational efficiency, randomised controlled trial, primary healthcare, process improvement", "contribution statement": "This paper provides the first experimental evidence for a replicable diagnostic method that identifies modifiable inefficiencies in community health centre workflows, offering a