diff --git a/pyproject.toml b/pyproject.toml
index a38bcc3..df5efa9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -23,6 +23,8 @@ classifiers = [
 dependencies = [
     "click>=8.1.8",
     "rich>=14.0.0",
+    "geopandas>=1.0.1",
+    "networkx>=3.4.2",
 ]
 
 [project.scripts]
diff --git a/src/pyhld/__init__.py b/src/pyhld/__init__.py
index 75cc6d7..c8bec53 100644
--- a/src/pyhld/__init__.py
+++ b/src/pyhld/__init__.py
@@ -2,6 +2,6 @@
 PyHLD - Python Fiber to the Home High Level Design Tool
 """
 
-__version__ = "0.1.0"
+__version__ = "0.2.0"
 __author__ = "Chris Bomar"
 __email__ = ""
\ No newline at end of file
diff --git a/src/pyhld/cli.py b/src/pyhld/cli.py
index 0b049d5..f2cad0f 100644
--- a/src/pyhld/cli.py
+++ b/src/pyhld/cli.py
@@ -1,8 +1,12 @@
 """Command line interface for PyHLD."""
-import click
-from rich.console import Console
-from rich.panel import Panel
 from . import __version__
+import click
+from pathlib import Path
+from rich.console import Console
+from .commands.design import run_design
+from .commands.calculate import run_calculate
+from .commands.validate import run_validate
+from .commands.graph import run_graph
 
 console = Console()
 
@@ -17,27 +21,31 @@ def main():
 @click.option('--output', '-o', type=click.Path(), help='Output file path')
 def design(input_file, output):
     """Create a high-level FTTH design."""
-    console.print(Panel.fit("🌐 Creating FTTH Design", title="PyHLD"))
-    console.print(f"Input file: {input_file}")
-    console.print(f"Output will be saved to: {output}")
+    run_design(input_file, output)
 
 @main.command()
 @click.option('--homes', '-h', type=int, help='Number of homes to be served')
 @click.option('--area', '-a', type=float, help='Service area in square kilometers')
 def calculate(homes, area):
     """Calculate basic FTTH metrics."""
-    console.print(Panel.fit("📊 Calculating FTTH Metrics", title="PyHLD"))
-    if homes and area:
-        density = homes / area
-        console.print(f"Homes: {homes}")
-        console.print(f"Area: {area} km²")
-        console.print(f"Density: {density:.2f} homes/km²")
+    run_calculate(homes, area)
 
 @main.command()
 def validate():
     """Validate design parameters and constraints."""
-    console.print(Panel.fit("✅ Validating Design", title="PyHLD"))
-    # Add validation logic here
+    run_validate()
+
+@main.command()
+@click.option('--input-file', '-i', 
+              type=click.Path(exists=True, path_type=Path), 
+              required=True,
+              help='Input line shapefile path')
+@click.option('--delete-duplicates', '-dd',
+              is_flag=True,
+              help='Delete duplicate geometries')
+def graph(input_file, delete_duplicates):
+    """Analyze network connectivity from line shapefile."""
+    run_graph(input_file, delete_duplicates)
 
 if __name__ == '__main__':
     main()
\ No newline at end of file
diff --git a/src/pyhld/commands/__init__.py b/src/pyhld/commands/__init__.py
new file mode 100644
index 0000000..3433037
--- /dev/null
+++ b/src/pyhld/commands/__init__.py
@@ -0,0 +1,13 @@
+"""Command implementations for PyHLD CLI tool."""
+
+from .design import run_design
+from .calculate import run_calculate
+from .validate import run_validate
+from .graph import run_graph
+
+__all__ = [
+    'run_design',
+    'run_calculate',
+    'run_validate',
+    'run_graph',
+]
\ No newline at end of file
diff --git a/src/pyhld/commands/calculate.py b/src/pyhld/commands/calculate.py
new file mode 100644
index 0000000..a30baf4
--- /dev/null
+++ b/src/pyhld/commands/calculate.py
@@ -0,0 +1,14 @@
+"""Calculate command implementation for FTTH metrics."""
+from rich.console import Console
+from rich.panel import Panel
+
+console = Console()
+
+def run_calculate(homes: int, area: float) -> None:
+    """Execute the calculate command logic."""
+    console.print(Panel.fit("📊 Calculating FTTH Metrics", title="PyHLD"))
+    if homes and area:
+        density = homes / area
+        console.print(f"Homes: {homes}")
+        console.print(f"Area: {area} km²")
+        console.print(f"Density: {density:.2f} homes/km²")
\ No newline at end of file
diff --git a/src/pyhld/commands/design.py b/src/pyhld/commands/design.py
new file mode 100644
index 0000000..7614b38
--- /dev/null
+++ b/src/pyhld/commands/design.py
@@ -0,0 +1,11 @@
+"""Design command implementation for FTTH high-level design."""
+from rich.console import Console
+from rich.panel import Panel
+
+console = Console()
+
+def run_design(input_file: str, output: str) -> None:
+    """Execute the design command logic."""
+    console.print(Panel.fit("🌐 Creating FTTH Design", title="PyHLD"))
+    console.print(f"Input file: {input_file}")
+    console.print(f"Output will be saved to: {output}")
\ No newline at end of file
diff --git a/src/pyhld/commands/graph.py b/src/pyhld/commands/graph.py
new file mode 100644
index 0000000..3fe5700
--- /dev/null
+++ b/src/pyhld/commands/graph.py
@@ -0,0 +1,312 @@
+"""Graph analysis command for FTTH network validation."""
+from pathlib import Path
+from rich.console import Console
+from rich.progress import Progress, SpinnerColumn, TextColumn
+from rich.panel import Panel
+from rich.table import Table
+import geopandas as gpd
+import networkx as nx
+from shapely.geometry import LineString
+
+console = Console()
+
+def get_geometry_error(geom) -> str:
+    """Analyze why a geometry is invalid."""
+    try:
+        if geom is None:
+            return "Null geometry"
+        if not isinstance(geom, LineString):
+            return f"Wrong geometry type: {geom.geom_type} (expected LineString)"
+        if geom.is_empty:
+            return "Empty geometry"
+        if not geom.is_valid:
+            return f"Invalid geometry: {geom.is_valid_reason}"
+        if geom.length == 0:
+            return "Zero-length line"
+        # Add detailed geometry info for debugging
+        return f"Geometry appears valid: Length={geom.length:.2f}, Points={len(geom.coords)}"
+    except Exception as e:
+        return f"Error analyzing geometry: {str(e)}"
+    
+def save_component_shapefile(gdf: gpd.GeoDataFrame, components: list, input_file: Path) -> Path:
+    """Save component information back to input shapefile."""
+    # Create a mapping of coordinates to component ID
+    coord_to_component = {}
+    for i, component in enumerate(components):
+        for node in component:
+            coord_to_component[node] = i
+
+    # If comp_id exists, warn user it will be replaced
+    if 'comp_id' in gdf.columns:
+        console.print("[yellow]Warning: Existing 'comp_id' column will be overwritten[/yellow]")
+        # Drop existing column to avoid dtype conflicts
+        gdf = gdf.drop(columns=['comp_id'])
+
+    # Create a new column for component ID
+    def get_component_id(row):
+        start = row.geometry.coords[0]
+        return coord_to_component.get(start, -1)
+
+    gdf['comp_id'] = gdf.apply(get_component_id, axis=1)
+    
+    # Save back to input shapefile
+    gdf.to_file(input_file)
+    return input_file
+
+def find_overlapping_segments(gdf: gpd.GeoDataFrame) -> list:
+    """Find overlapping line segments in the shapefile."""
+    overlap_pairs = set()  # Store only the index pairs
+    overlap_info = {}      # Store the additional info separately
+    sindex = gdf.sindex
+    
+    for idx, row in gdf.iterrows():
+        possible_matches_idx = list(sindex.intersection(row.geometry.bounds))
+        possible_matches = gdf.iloc[possible_matches_idx]
+        possible_matches = possible_matches.drop(idx, errors='ignore')
+        
+        for match_idx, match_row in possible_matches.iterrows():
+            pair = tuple(sorted([idx, match_idx]))
+            if pair not in overlap_pairs:
+                intersection = row.geometry.intersection(match_row.geometry)
+                
+                is_overlap = False
+                if intersection.geom_type == 'LineString':
+                    is_overlap = intersection.length > 0.001
+                elif intersection.geom_type == 'MultiLineString':
+                    is_overlap = any(part.length > 0.001 for part in intersection.geoms)
+                elif intersection.geom_type == 'GeometryCollection':
+                    line_parts = [geom for geom in intersection.geoms 
+                                if geom.geom_type in ('LineString', 'MultiLineString')]
+                    is_overlap = any(part.length > 0.001 for part in line_parts)
+                
+                if is_overlap:
+                    overlap_pairs.add(pair)
+                    overlap_info[pair] = {
+                        'intersection_type': intersection.geom_type,
+                        'intersection_length': intersection.length if hasattr(intersection, 'length') else 0,
+                        'line1_length': row.geometry.length,
+                        'line2_length': match_row.geometry.length
+                    }
+    
+    # Convert to list of tuples with info
+    return [(p[0], p[1], overlap_info[p]) for p in sorted(overlap_pairs)]
+
+def delete_duplicate_geometries(gdf: gpd.GeoDataFrame) -> gpd.GeoDataFrame:
+    """Remove duplicate geometries from GeoDataFrame while preserving LineStrings.
+    
+    This mimics QGIS's Delete Duplicate Geometries tool behavior:
+    - Maintains single LineString geometries
+    - Preserves attributes of first occurrence
+    - Removes exact geometric duplicates
+    """
+    # Create a string representation of coordinates for comparison
+    gdf['geom_coords'] = gdf.geometry.apply(lambda x: str(list(x.coords)))
+    
+    # Keep first occurrence of each unique geometry
+    unique_gdf = gdf.drop_duplicates(subset=['geom_coords'])
+    
+    # Drop the temporary column
+    unique_gdf = unique_gdf.drop(columns=['geom_coords'])
+    
+    # Reset index to maintain continuous row numbers
+    return unique_gdf.reset_index(drop=True)
+
+def run_graph(input_file: Path, delete_duplicates: bool = False) -> None:
+    """Analyze shapefile and create network graph."""
+    console.print(Panel.fit("🗺️  Analyzing Network Graph", title="PyHLD"))
+    
+    progress = Progress(
+        SpinnerColumn(),
+        TextColumn("[progress.description]{task.description}"),
+        console=console,
+    )
+    
+    with progress:
+        if not input_file.exists():
+            console.print(f"[red]Error: File {input_file} not found[/red]")
+            return
+
+        # Create tasks with explicit IDs
+        read_task = progress.add_task("Reading shapefile", total=1)
+        validate_task = progress.add_task("Validating geometries", total=1, visible=False)
+        create_graph_task = progress.add_task("Creating network graph", total=1, visible=False)
+        check_connect_task = progress.add_task("Checking connectivity", total=1, visible=False)
+        
+        try:
+            gdf = gpd.read_file(input_file)
+            progress.update(read_task, completed=True)
+            progress.refresh()
+        except Exception as e:
+            progress.update(read_task, completed=True)
+            progress.refresh()
+            console.print(f"\n[red]Error reading shapefile: {e}[/red]")
+            return
+            
+        progress.update(validate_task, visible=True)
+        progress.refresh()
+        
+        # Validate geometries
+        try:
+            gdf['geom_check'] = gdf.geometry.map(lambda g: get_geometry_error(g))
+            invalid_rows = gdf[gdf['geom_check'].str.contains('Error|Null|Wrong|Empty|Invalid|Zero')].copy()
+
+            if not invalid_rows.empty:
+                progress.update(validate_task, completed=True)
+                progress.refresh()
+                progress.stop()
+                
+                console.print(f"\n[red]Error: Found {len(invalid_rows)} problematic geometries[/red]")
+                
+                table = Table(title="Geometry Analysis Details")
+                table.add_column("DataFrame Row (0-based)", justify="right")
+                table.add_column("QGIS Row (1-based)", justify="right")
+                table.add_column("Attributes")
+                table.add_column("Diagnosis", style="red")
+                
+                for idx, row in invalid_rows.iterrows():
+                    attrs = {k:v for k,v in row.items() if k not in ['geometry', 'geom_check']}
+                    qgis_row = idx + 1  # Convert to 1-based indexing
+                    table.add_row(
+                        str(idx),
+                        str(qgis_row),
+                        str(attrs),
+                        row['geom_check']
+                    )
+                
+                console.print(table)
+                console.print("\n[yellow]Note about Row Numbers:[/yellow]")
+                console.print("• DataFrame Row: Python's 0-based index")
+                console.print("• QGIS Row: QGIS's 1-based row number (use this in QGIS expressions)")
+                
+                console.print("\n[yellow]Troubleshooting Tips:[/yellow]")
+                qgis_rows = ", ".join(str(idx + 1) for idx in invalid_rows.index)
+                console.print("1. Open the shapefile in QGIS")
+                console.print("2. Find invalid features using this expression:")
+                console.print(f"   $id IN ({qgis_rows})")
+                console.print("3. Use 'Vertex Tool' to inspect the feature's geometry")
+                return
+                
+            if not all(geom.geom_type == 'LineString' for geom in gdf.geometry):
+                console.print("[red]Error: Shapefile must contain only LineString features[/red]")
+                return
+        except Exception as e:
+            console.print(f"[red]Error validating geometries: {e}[/red]")
+            return
+        
+        progress.update(validate_task, completed=True)
+        progress.refresh()
+
+        if delete_duplicates:
+            progress.add_task("Removing duplicate geometries...", total=1)
+            try:
+                original_count = len(gdf)
+                gdf = delete_duplicate_geometries(gdf)
+                deleted_count = original_count - len(gdf)
+                
+                if deleted_count > 0:
+                    console.print(f"\n[green]Removed {deleted_count} duplicate geometries[/green]")
+                    console.print("[yellow]Note:[/yellow] This operation preserves single LineString geometries")
+                    # Save changes back to file
+                    gdf.to_file(input_file)
+                    console.print(f"[green]Updated shapefile saved: {input_file}[/green]\n")
+                else:
+                    console.print("\n[green]No duplicate geometries found[/green]\n")
+            except Exception as e:
+                console.print(f"\n[red]Error removing duplicates: {e}[/red]\n")
+                return
+
+        # Overlap checking
+        progress.update(validate_task, description="Checking for overlaps", visible=True)
+        try:
+            overlaps = find_overlapping_segments(gdf)
+            if overlaps:
+                console.print(f"\n[yellow]Warning: Found {len(overlaps)} overlapping segment pairs[/yellow]")
+                
+                table = Table(title="Overlapping Segments")
+                table.add_column("Segment 1 (QGIS Row)", justify="right")
+                table.add_column("Segment 2 (QGIS Row)", justify="right")
+                table.add_column("Overlap Type", justify="left")
+                table.add_column("Overlap Length", justify="right")
+                
+                # Sort by overlap length for better readability
+                sorted_overlaps = sorted(overlaps, key=lambda x: x[2]['intersection_length'], reverse=True)
+                
+                for idx1, idx2, info in sorted_overlaps:
+                    # Convert to QGIS 1-based indexing
+                    table.add_row(
+                        str(idx1 + 1),
+                        str(idx2 + 1),
+                        info['intersection_type'],
+                        f"{info['intersection_length']:.2f}"
+                    )
+                
+                console.print(table)
+                console.print("\n[yellow]Troubleshooting Tips:[/yellow]")
+                overlap_expr = " OR ".join([f"$id IN ({i1 + 1}, {i2 + 1})" for i1, i2, _ in overlaps])
+                console.print("1. Open the shapefile in QGIS")
+                console.print("2. Find overlapping segments using this expression:")
+                console.print(f"   {overlap_expr}")
+                console.print("3. Consider merging or removing redundant segments")
+                console.print("4. Common causes of overlaps:")
+                console.print("   • Duplicated lines")
+                console.print("   • Lines drawn multiple times")
+                console.print("   • Segments that should be split at intersections\n")
+        except Exception as e:
+            console.print(f"[red]Error checking for overlaps: {e}[/red]")
+
+        # Create network graph
+        progress.update(create_graph_task, visible=True)
+        G = nx.Graph()
+        
+        # Add edges from line geometries
+        for _, row in gdf.iterrows():
+            line = row.geometry
+            try:
+                start = line.coords[0]
+                end = line.coords[-1]
+                G.add_edge(start, end)
+            except Exception as e:
+                console.print(f"[red]Error processing line: {e}[/red]")
+                continue
+
+        # Check if graph has any edges
+        if len(G.edges) == 0:
+            console.print("[red]Error: No valid edges could be created from the shapefile[/red]")
+            return
+        
+        progress.update(create_graph_task, completed=True)
+        progress.refresh()
+
+        # Check connectivity
+        progress.update(check_connect_task, visible=True)
+        is_connected = nx.is_connected(G)
+        progress.update(check_connect_task, completed=True)
+        progress.refresh()
+
+        # Stop progress before printing results
+        progress.stop()
+
+        # Print CRS information
+        crs = gdf.crs
+        if crs is None:
+            console.print("\n[yellow]Warning: No CRS defined in shapefile[/yellow]\n")
+        else:
+            console.print(f"\nCRS: {crs.name}")
+            console.print(f"Units: {crs.axis_info[0].unit_name}\n")
+
+        # Print results
+        if is_connected:
+            console.print("[green]✓ Network is fully connected[/green]")
+            console.print(f"Total nodes: {len(G.nodes)}")
+            console.print(f"Total edges: {len(G.edges)}\n")
+        else:
+            console.print("[red]✗ Network is not fully connected[/red]")
+            components = list(nx.connected_components(G))
+            console.print(f"Found {len(components)} disconnected components")
+            console.print(f"Largest component has {max(len(c) for c in components)} nodes")
+            try:
+                output_file = save_component_shapefile(gdf, components, input_file)
+                console.print(f"\n[green]Component IDs added to:[/green] {output_file}")
+                console.print("[yellow]Note:[/yellow] Open in QGIS and style by 'comp_id' to visualize\n")
+            except Exception as e:
+                console.print(f"\n[red]Error updating shapefile: {e}[/red]\n")
\ No newline at end of file
diff --git a/src/pyhld/commands/validate.py b/src/pyhld/commands/validate.py
new file mode 100644
index 0000000..90753e4
--- /dev/null
+++ b/src/pyhld/commands/validate.py
@@ -0,0 +1,10 @@
+"""Validate command implementation for FTTH design parameters."""
+from rich.console import Console
+from rich.panel import Panel
+
+console = Console()
+
+def run_validate() -> None:
+    """Execute the validate command logic."""
+    console.print(Panel.fit("✅ Validating Design", title="PyHLD"))
+    # Add validation logic here
\ No newline at end of file