Competitive advantage from proprietary longitudinal data. Build through rigorous CC-DATA-01 documentation every engagement. After 100 clients × 4 quarters = 400 entity-quarter observations. Competitor cannot replicate without running equivalent engagement volume. Data moat enables: sharper diagnostics (causal model improves with data), predictive posture modeling (forecast outcomes from maintenance patterns), proprietary benchmarks (compare client to cohort). Maintain through strict engagement record discipline. Data moat compounds — early documentation creates increasing competitive advantage.