diff --git a/src/reskit/level/system.rs b/src/reskit/level/system.rs
index 22edc2f..dc69e5e 100644
--- a/src/reskit/level/system.rs
+++ b/src/reskit/level/system.rs
@@ -1,8 +1,8 @@
-use std::{error::Error, convert::TryInto, cmp::max};
+use std::{error::Error, convert::TryInto, cmp::max, num::ParseIntError};
 use image::GenericImageView;
 use linked_hash_set::LinkedHashSet;
 use crate::reskit::{tileset::image_to_tiles, utility::{symbol_to_pascal, print_info}, cli::settings::TileOrder};
-use super::converter::{TiledTilemap, Layer, SystemPlane};
+use super::{converter::{TiledTilemap, Layer, SystemPlane}, ecs::Component};
 
 /**
  * Output the .bin and .pal file (using `tileset` tool to build it) containing each of the tiles
@@ -241,7 +241,7 @@ pub fn get_ecs( tilemap: &TiledTilemap ) -> Result<Vec<u8>, Box<dyn Error>> {
 
         // Assign this unique combination of components a type id
         // by inserting it into `types`
-        types.insert( components );
+        types.insert_if_absent( components );
     }
 
     let largest_type_size: u16 = types.iter()
@@ -300,7 +300,84 @@ pub fn get_ecs( tilemap: &TiledTilemap ) -> Result<Vec<u8>, Box<dyn Error>> {
         result.push( 0xFF );
     }
 
-    // TODO: Component Attribute Table
+    // Component Attribute Table
+    // Index all attribute values that do not parse to u16
+    let mut attribute_value_ids: LinkedHashSet<String> = LinkedHashSet::new();
+    for entity in &tilemap.ecs {
+        for ( _, component ) in &entity.components {
+            for ( _, attribute_value ) in &component.attributes {
+                // Handling various types from Tiled Editor
+                // * If it is "true" or "false", leave it alone. It will be articulated as 1 or 0.
+                // * If it can be parsed as a u16, leave it alone.
+                // * In all other cases, add to attribute_value_ids to create an index.
+                if attribute_value != "true" && attribute_value != "false" {
+                    let try_as_u16: Result<u16, ParseIntError> = attribute_value.parse();
+                    if let Err( _ ) = try_as_u16 {
+                        attribute_value_ids.insert_if_absent( attribute_value.clone() );
+                        print_info( &format!( "Attribute Value ID {}: \"{}\"", attribute_value_ids.len() - 1, attribute_value ) );
+                    }
+                }
+            }
+        }
+    }
+
+    // Find the largest size of a combination of attributes (the component attribute union size)
+    let largest_type_attributes_size = tilemap.ecs.iter()
+                                                  .map( | entity | {
+                                                    let mut total_attributes_for_entity = 0;
+
+                                                    for ( _, component ) in &entity.components {
+                                                        total_attributes_for_entity += component.attributes.len()
+                                                    }
+
+                                                    total_attributes_for_entity
+                                                } )
+                                                .reduce( | prev, current | max( prev, current ) )
+                                                .ok_or( "internal error: no largest type attributes size" )? as u16;
+
+    // 2 bytes: Component Attribute Union Size
+    result.extend( largest_type_attributes_size.to_be_bytes() );
+
+    // For (Object Table Size):
+    for entity in &tilemap.ecs {
+        // (Component Attribute Union Size) bytes: Component attribute settings
+        // Sort components in this entity alphabetically, ascending
+        let mut components: Vec<(&String, &Component)> = entity.components.iter().collect();
+        components.sort_by( | a, b | a.0.partial_cmp( b.0 ).expect( "internal error: unsortable" ) );
+
+        let mut written_attributes = 0;
+        for ( _, component ) in &components {
+            // Sort attributes in each component alphabetically
+            let mut attributes: Vec<(&String, &String)> = component.attributes.iter().collect();
+            attributes.sort_by( | a, b | a.0.partial_cmp( b.0 ).expect( "internal error: unsortable" ) );
+
+            for ( _, attribute_value ) in attributes {
+                written_attributes += 1;
+                match attribute_value.as_str() {
+                    "true" => result.extend( ( 1 as u16 ).to_be_bytes() ),
+                    "false" => result.extend( ( 0 as u16 ).to_be_bytes() ),
+                    string => {
+                        let try_as_u16: Result<u16, ParseIntError> = string.parse();
+                        if let Ok( numeric ) = try_as_u16 {
+                            result.extend( numeric.to_be_bytes() );
+                        } else {
+                            let id: u16 = attribute_value_ids.iter()
+                                                            .position( | attribute_value | attribute_value == &string )
+                                                            .ok_or( "internal error: no type id" )? as u16;
+
+                            result.extend( id.to_be_bytes() );
+                        }
+                    }
+                }
+            }
+        }
+
+        // Fill the remainder of the union with 0xFF, if needed
+        let remainder = largest_type_attributes_size - written_attributes;
+        for _ in 0..remainder {
+            result.extend( ( 0xFFFF as u16 ).to_be_bytes() );
+        }
+    }
 
     // Output IDs to terminal
     let component_ids: Vec<String> = component_ids.into_iter().collect();