diff --git a/tools/combine b/tools/combine
index e975c0d..3196e6e 100755
--- a/tools/combine
+++ b/tools/combine
@@ -28,11 +28,17 @@ TPL_TEST_PATH="$PATH_TOOLS/combine-test.tpl"
 TPL_VAR='/**{CONTENT}**/'
 RMTRAIL="$PATH_TOOLS/rmtrail"
 
-# order matters
-CAT_MODS="warn prop_parser util VisibilityObjectFactory"
-CAT_MODS="$CAT_MODS FallbackVisibilityObjectFactory member_builder"
-CAT_MODS="$CAT_MODS ClassBuilder VisibilityObjectFactoryFactory"
-CAT_MODS="$CAT_MODS class class_final class_abstract interface"
+# determine the order in which modules must be concatenated; order matters to
+# ensure dependencies are loaded before the module that depends on them
+CAT_MODULES=$(
+    cd "$PATH_TOOLS/../" &&
+    grep -rIo ' require(.*)' lib/ \
+        | sed "s/^lib\///;s/\.js://;s/require(.*'\/\(.*\)'.*/\1/" \
+        | node tools/combine-order.js
+) || {
+    echo "Failed to get module list" >&2
+    exit 3
+}
 
 ##
 # Output template header
@@ -85,7 +91,7 @@ fi
 tpl_header
 
 # output each of the modules
-for module in $CAT_MODS; do
+for module in $CAT_MODULES; do
     filename="$PATH_LIB/$module.$MODULE_EXT"
 
     if [ ! -f "$filename" ]; then
diff --git a/tools/combine-order.js b/tools/combine-order.js
new file mode 100644
index 0000000..0f2afc6
--- /dev/null
+++ b/tools/combine-order.js
@@ -0,0 +1,190 @@
+/**
+ * Determines dependency order
+ *
+ * This script will determine the order in which files must be concatenated in
+ * order to run properly. Dependencies must be added before the file that
+ * depends on them.
+ *
+ * Circular dependencies are not supported, nor should they be.
+ *
+ *  Copyright (C) 2010 Mike Gerwitz
+ *
+ *  This file is part of ease.js.
+ *
+ *  ease.js is free software: you can redistribute it and/or modify it under the
+ *  terms of the GNU Lesser General Public License as published by the Free
+ *  Software Foundation, either version 3 of the License, or (at your option)
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful, but WITHOUT
+ *  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ *  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License
+ *  for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @author  Mike Gerwitz
+ * @package tools
+ */
+
+
+// files and their dependencies are expected from stdin in the following format,
+// one relationship per line:
+//   file dep
+getStdinData( function( data )
+{
+    var ordered = [],
+        deps    = parseLines( data ),
+        current = ''
+    ;
+
+    // Continue the ordering process until there are no more files remaining.
+    // This is necessary because not all files may be a dependency of another.
+    // There may be groups of completely unrelated files.
+    while ( current = Object.keys( deps )[0] )
+    {
+        orderDeps( deps, current, ordered );
+    }
+
+    outputFiles( ordered );
+} );
+
+
+/**
+ * Output each file, one per line
+ *
+ * @param  {Array.<string>} files  files to output
+ *
+ * @return  {undefined}
+ */
+function outputFiles( files )
+{
+    files.forEach( function( file )
+    {
+        console.log( file );
+    } );
+}
+
+
+/**
+ * Recursively order dependencies for each file
+ *
+ * For each file (current var), loop through each of its dependencies. Before
+ * adding itself to the list, it will recurse and loop through the dependency's
+ * dependencies. This process will continue until no more dependencies are
+ * found or found dependencies have already been parsed. This will result in the
+ * file being added to the list after each of its dependencies, recursively. It
+ * may be easier just to read the actual code.
+ *
+ * Circular dependencies are not supported, but they are detected and will
+ * cause termination of the script with a non-zero exit code.
+ *
+ * @param  {Object}  deps     dependency list
+ * @param  {string}  current  file to parse
+ * @param  {Array}   ordered  destination array
+ *
+ * @return  {Array}  ordered array
+ */
+var orderDeps = ( function()
+{
+    var processed = {},
+        processing = {};
+
+    return function orderDeps( deps, current, ordered )
+    {
+        // if we've already processed this dependency, don't do it again
+        if ( processed[ current ] )
+        {
+            return;
+        }
+
+        // prevent infinite recursion that would be caused by circular
+        // dependencies
+        if ( processing[ current ] )
+        {
+            console.error( "Circular dependency detected: %s", current );
+            process.exit( 1 );
+        }
+
+        processing[ current ] = true;
+
+        // process each dependency for this file
+        ( deps[ current ] || [] ).forEach( function( dep )
+        {
+            // first, insert dependencies of our dependency
+            orderDeps( deps, dep, ordered );
+        } );
+
+        // add self /after/ dependencies have been added
+        ordered.push( current );
+        processed[ current ] = true;
+
+        // ensure we don't parse it again
+        delete deps[ current ];
+        delete processing[ current ];
+
+        return ordered;
+    };
+} )();
+
+
+/**
+ * Parse each line into a dependency list for each file
+ *
+ * @param  {string}  data  string data to parse
+ *
+ * @return  {Object.<Array.<string>>}  dependency list for each file
+ */
+function parseLines( data )
+{
+    var lines = data.split( '\n' ),
+        deps  = {};
+
+    lines.forEach( function( line )
+    {
+        // skip blank lines
+        if ( !line )
+        {
+            return;
+        }
+
+        var dep_info = line.split( ' ' ),
+            file     = dep_info[ 0 ],
+            dep      = dep_info[ 1 ]
+        ;
+
+        deps[ file ] = deps[ file ] || [];
+        deps[ file ].push( dep );
+    } );
+
+    return deps;
+}
+
+
+/**
+ * Asynchronously retrieve data from stdin
+ *
+ * @param  {function(Object)}  callback to call with data
+ *
+ * @return  {string}  data from stdin
+ */
+function getStdinData( callback )
+{
+    var data = '';
+
+    process.stdin.resume();
+    process.stdin.setEncoding( 'ascii' );
+
+    process.stdin
+        .on( 'data', function( chunk )
+        {
+            data += chunk;
+        } )
+        .on( 'end', function()
+        {
+            callback( data );
+        } )
+    ;
+}
+