flowchart LR
    A["Allocating resources<br/>equally across all causes<br/>yields low improvement efficiency"] --"Focused analysis & improvement<br/>on the top 20% of causes"--> B["Select the<br/>vital few priorities"] --"Concentrate resources<br/>for 80% of the effect"--> C["Maximum quality improvement<br/>at minimum cost"]

    style A fill:#FFEBEE,stroke:#D32F2F,color:#000
    style B fill:#E3F2FD,stroke:#1976D2,color:#000
    style C fill:#E8F5E9,stroke:#388E3C,color:#000
  

    flowchart TD
    subgraph R1["​"]
        direction LR
        P1["Quality management<br/>The top 20% of defect causes<br/>account for 80% of all defects<br/>focus on eliminating key defects"]
        P2["IT systems<br/>The top 20% of features<br/>account for 80% of usage<br/>prioritize optimizing key features"]
    end
    subgraph R2["​"]
        direction LR
        P3["Security threats<br/>The top 20% of vulnerabilities<br/>cause 80% of breaches<br/>focus on the OWASP Top 10"]
        P4["Business<br/>The top 20% of customers<br/>contribute 80% of revenue<br/>focus management on key customers"]
    end

    style P1 fill:#E3F2FD,stroke:#1976D2,color:#000
    style P2 fill:#F3E5F5,stroke:#7B1FA2,color:#000
    style P3 fill:#FFEBEE,stroke:#D32F2F,color:#000
    style P4 fill:#E8F5E9,stroke:#388E3C,color:#000
    style R1 fill:none,stroke:none
    style R2 fill:none,stroke:none
  

    flowchart LR
    S1["1. Collect data<br/>Gather occurrence frequency<br/>by defect type<br/>define measurement period"]
    S2["2. Sort by frequency<br/>Sort in descending order<br/>calculate cumulative percentage<br/>mark the 80% line"]
    S3["3. Build the chart<br/>Bars: frequency/count<br/>Line: cumulative percentage<br/>80% cutoff line"]
    S4["4. Identify key causes<br/>Items within<br/>the cumulative 80% = Vital Few<br/>priority improvement targets"]
    S5["5. Execute improvement<br/>Root-cause analysis with<br/>Fishbone / 5-Why<br/>re-measure after improvement"]

    S1 --> S2 --> S3 --> S4 --> S5
    S5 -->|"Repeat after<br/>verifying effect"| S1

    style S1 fill:#E3F2FD,stroke:#1976D2,color:#000
    style S2 fill:#F3E5F5,stroke:#7B1FA2,color:#000
    style S3 fill:#FFF3E0,stroke:#F57C00,color:#000
    style S4 fill:#FFEBEE,stroke:#D32F2F,color:#000
    style S5 fill:#E8F5E9,stroke:#388E3C,color:#000