Implementation Standards and Industry-Specific Adaptation of SAP-Lean Production Integration in Manufacturing: A Multi-Case Validation with Quantitative Performance Optimization

The decoupling between SAP systems and lean production (LP) has become a critical barrier to manufacturing digital transformation, leading to 15-22% overproduction rates, 20-30% delayed deliveries, and 12-18% cost wastage. To address this, this study proposes a systematic four-stage integration framework (Needs Quantification → System Configuration → Process Reengineering → Dynamic Evaluation) and industry-specific adaptation schemes for the automotive, electronics, and equipment manufacturing sectors. Key innovations include: (1) A Lean Demand Prioritization Matrix (LDPM) integrating 17 KPIs (e.g., production plan update frequency, material arrival tolerance) with AHP-based weight assignment, improving needs analysis accuracy by 32.7% vs. traditional interviews; (2) A Real-Time Lean Rule Embedding Engine (RTLREE) that embeds JIT, kanban, and TPM rules into SAP modules, achieving 99.2% rule execution accuracy—18.5 percentage points higher than existing methods; (3) Industry-specific modules (e.g., automotive BOM auto-switching, electronics rapid changeover) with 89.5% functional reuse rate. Validated across 32 manufacturing enterprises (16 experimental, 16 control) in China, Germany, and Japan over 18 months, the framework achieved: (1) Average overproduction rate reduction by 68.3% (from 15.2% to 4.8%, p