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+## Level 1: System Context Diagram
+
+```mermaid
+graph TB
+    subgraph "External Users"
+        DEV[Python Developers]
+        SYS[System Administrators]
+        APP[Application Users]
+    end
+    
+    subgraph "External Systems"
+        OS[Operating System<br/>Windows/macOS/Linux]
+        FS[File System]
+        NET[Network Services]
+        LIB[Third-party Libraries]
+        EXT[C Extensions]
+    end
+    
+    subgraph "CPython System"
+        CPY[CPython Interpreter<br/>Python]
+    end
+    
+    DEV -->|"Writes Python Code"| CPY
+    SYS -->|"Configures & Deploys"| CPY
+    APP -->|"Runs Applications"| CPY
+    
+    CPY -->|"System Calls"| OS
+    CPY -->|"File I/O"| FS
+    CPY -->|"Network Operations"| NET
+    CPY -->|"Imports Modules"| LIB
+    CPY -->|"Loads Extensions"| EXT
+    
+    OS -->|"Process Management"| CPY
+    FS -->|"File Access"| CPY
+    NET -->|"Network Data"| CPY
+    LIB -->|"Standard Library"| CPY
+    EXT -->|"Native Code"| CPY
+```
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