diff --git a/SLS_C/build_system/targets/base.py b/SLS_C/build_system/targets/base.py
index e69de29..d36e45d 100644
--- a/SLS_C/build_system/targets/base.py
+++ b/SLS_C/build_system/targets/base.py
@@ -0,0 +1,232 @@
+#!/usr/bin/env python3
+"""
+Base target interface for the build system.
+Defines the abstract Target class that all specific targets must implement.
+"""
+
+from abc import ABC, abstractmethod
+from pathlib import Path
+from typing import List, Optional
+from enum import Enum
+
+
+class BuildType(Enum):
+    """Type of build to perform."""
+    RELEASE = "release"
+    DEBUG = "debug"
+    TEST = "test"
+    
+    def __str__(self) -> str:
+        return self.value
+
+
+class Target(ABC):
+    """Abstract base class for all build targets."""
+    
+    def __init__(self, name: str):
+        """
+        Initialize the target.
+        
+        Args:
+            name: Target name (e.g., "linux", "windows", "rp2040")
+        """
+        self.name = name
+        self._build_type = BuildType.RELEASE
+    
+    @property
+    def build_type(self) -> BuildType:
+        """Get the current build type."""
+        return self._build_type
+    
+    @build_type.setter
+    def build_type(self, value: BuildType) -> None:
+        """Set the build type."""
+        self._build_type = value
+    
+    @abstractmethod
+    def build(self) -> bool:
+        """
+        Build the target.
+        
+        Returns:
+            True if build succeeded, False otherwise
+        """
+        pass
+    
+    @abstractmethod
+    def clean(self) -> bool:
+        """
+        Clean build artifacts for this target.
+        
+        Returns:
+            True if clean succeeded, False otherwise
+        """
+        pass
+    
+    def run(self) -> bool:
+        """
+        Run the built executable.
+        
+        Returns:
+            True if execution succeeded, False otherwise
+        
+        Raises:
+            NotImplementedError: If the target doesn't support running
+        """
+        raise NotImplementedError(f"Target '{self.name}' does not support running")
+    
+    def test(self) -> bool:
+        """
+        Build and run tests for this target.
+        
+        Returns:
+            True if tests passed, False otherwise
+        
+        Raises:
+            NotImplementedError: If the target doesn't support testing
+        """
+        raise NotImplementedError(f"Target '{self.name}' does not support testing")
+    
+    def debug(self) -> bool:
+        """
+        Launch debugger with the built executable.
+        
+        Returns:
+            True if debugger launched successfully, False otherwise
+        
+        Raises:
+            NotImplementedError: If the target doesn't support debugging
+        """
+        raise NotImplementedError(f"Target '{self.name}' does not support debugging")
+    
+    def get_output_path(self) -> Optional[Path]:
+        """
+        Get the path to the main output binary.
+        
+        Returns:
+            Path to output binary, or None if not applicable
+        """
+        return None
+    
+    def get_test_output_path(self) -> Optional[Path]:
+        """
+        Get the path to the test binary.
+        
+        Returns:
+            Path to test binary, or None if not applicable
+        """
+        return None
+    
+    def get_build_dir(self) -> Optional[Path]:
+        """
+        Get the build directory for this target.
+        
+        Returns:
+            Path to build directory, or None if using shared directories
+        """
+        return None
+    
+    def supports_command(self, command: str) -> bool:
+        """
+        Check if this target supports a specific command.
+        
+        Args:
+            command: Command name ("build", "run", "test", "debug", "clean")
+        
+        Returns:
+            True if command is supported, False otherwise
+        """
+        if command == "build":
+            return True
+        elif command == "clean":
+            return True
+        elif command == "run":
+            try:
+                # Check if run() is overridden
+                return type(self).run != Target.run
+            except AttributeError:
+                return False
+        elif command == "test":
+            try:
+                return type(self).test != Target.test
+            except AttributeError:
+                return False
+        elif command == "debug":
+            try:
+                return type(self).debug != Target.debug
+            except AttributeError:
+                return False
+        return False
+    
+    def get_sources(self, exclude: Optional[List[str]] = None) -> List[Path]:
+        """
+        Get list of source files to compile.
+        
+        Args:
+            exclude: List of source file names to exclude
+        
+        Returns:
+            List of source file paths
+        """
+        from build_system.config import get_config
+        config = get_config()
+        
+        sources = list(config.src_dir.glob("*.c"))
+        
+        if exclude:
+            sources = [s for s in sources if s.name not in exclude]
+        
+        return sources
+    
+    def get_test_sources(self) -> List[Path]:
+        """
+        Get list of test source files.
+        
+        Returns:
+            List of test source file paths
+        """
+        from build_system.config import get_config
+        config = get_config()
+        
+        if not config.test_dir.exists():
+            return []
+        
+        return list(config.test_dir.glob("*.c"))
+    
+    def generate_tests(self) -> bool:
+        """
+        Generate test files from YAML if needed.
+        
+        Returns:
+            True if generation succeeded or was not needed, False otherwise
+        """
+        from build_system.config import get_config
+        from build_system.utils import run
+        
+        config = get_config()
+        
+        script = config.test_script_path
+        yaml = config.test_yaml_path
+        output = config.test_output_file
+        
+        if not script.exists() or not yaml.exists():
+            print("Test generation skipped (missing files).")
+            return False
+        
+        if output.exists() and output.stat().st_mtime > yaml.stat().st_mtime:
+            return True
+        
+        try:
+            run([config.python_command, str(script), str(yaml), str(output)])
+            return True
+        except Exception as e:
+            print(f"ERROR: Test generation failed: {e}")
+            return False
+    
+    def __str__(self) -> str:
+        """String representation of the target."""
+        return f"{self.name}"
+    
+    def __repr__(self) -> str:
+        """Detailed string representation."""
+        return f"Target(name='{self.name}', build_type={self.build_type})"