diff --git a/src/SiteAliasFileLoader.php b/src/SiteAliasFileLoader.php
index 4f5cdc8..ce422e7 100644
--- a/src/SiteAliasFileLoader.php
+++ b/src/SiteAliasFileLoader.php
@@ -217,7 +217,7 @@ protected function createAliasRecordsFromSiteData($sitename, $siteData, $locatio
             return $result;
         }
         foreach ($siteData as $envName => $data) {
-            if (is_array($data)) {
+            if (is_array($data) && $this->isValidEnvName($envName)) {
                 $aliasName = new SiteAliasName($sitename, $envName, $location);
 
                 $processor = new ConfigProcessor();
@@ -228,6 +228,17 @@ protected function createAliasRecordsFromSiteData($sitename, $siteData, $locatio
         return $result;
     }
 
+    /**
+     * isValidEnvName determines if a given entry should be skipped or not
+     * (e.g. the "common" entry).
+     *
+     * @param string $envName The environment name to test
+     */
+    protected function isValidEnvName($envName)
+    {
+        return $envName != 'common';
+    }
+
     /**
      * Store an alias record in a list. If the alias record has
      * a known name, then the key of the list will be the record's name.
diff --git a/src/SiteAliasManager.php b/src/SiteAliasManager.php
index cbb5df9..2efce6b 100644
--- a/src/SiteAliasManager.php
+++ b/src/SiteAliasManager.php
@@ -30,6 +30,7 @@ public function __construct($aliasLoader = null, $root = '')
     public function setReferenceData($data)
     {
         $this->aliasLoader->setReferenceData($data);
+        return $this;
     }
 
     /**
@@ -160,10 +161,10 @@ public function getAlias($aliasName)
      * If the provided name is a site specification et. al.,
      * then this method will return 'false'.
      *
-     * @param string $name Alias name or site specification
+     * @param string $name Alias name
      * @return AliasRecord[]|false
      */
-    public function getMultiple($name)
+    public function getMultiple($name = '')
     {
         if (empty($name)) {
             return $this->aliasLoader->loadAll();
diff --git a/tests/SiteAliasFileLoaderTest.php b/tests/SiteAliasFileLoaderTest.php
index 7e55ac3..7c66758 100644
--- a/tests/SiteAliasFileLoaderTest.php
+++ b/tests/SiteAliasFileLoaderTest.php
@@ -142,7 +142,7 @@ public function testLoadAll()
         $this->sut->addSearchLocation($this->fixturesDir() . '/sitealiases/other');
 
         $all = $this->sut->loadAll();
-        $this->assertEquals('@other.single.common,@other.single.dev,@other.single.other,@single.alternate,@single.common,@single.dev,@wild.*,@wild.common,@wild.dev', implode(',', array_keys($all)));
+        $this->assertEquals('@other.single.dev,@other.single.other,@single.alternate,@single.dev,@wild.*,@wild.dev', implode(',', array_keys($all)));
     }
 
     public function testLoadMultiple()
@@ -151,7 +151,7 @@ public function testLoadMultiple()
         $this->sut->addSearchLocation($this->fixturesDir() . '/sitealiases/other');
 
         $aliases = $this->sut->loadMultiple('single');
-        $this->assertEquals('@single.dev,@single.alternate,@single.common,@other.single.dev,@other.single.other,@other.single.common', implode(',', array_keys($aliases)));
+        $this->assertEquals('@single.dev,@single.alternate,@other.single.dev,@other.single.other', implode(',', array_keys($aliases)));
     }
 
     public function testLoadLocation()
@@ -160,6 +160,6 @@ public function testLoadLocation()
         $this->sut->addSearchLocation($this->fixturesDir() . '/sitealiases/other');
 
         $aliases = $this->sut->loadLocation('other');
-        $this->assertEquals('@other.single.dev,@other.single.other,@other.single.common', implode(',', array_keys($aliases)));
+        $this->assertEquals('@other.single.dev,@other.single.other', implode(',', array_keys($aliases)));
     }
 }
diff --git a/tests/SiteAliasManagerTest.php b/tests/SiteAliasManagerTest.php
new file mode 100644
index 0000000..090a802
--- /dev/null
+++ b/tests/SiteAliasManagerTest.php
@@ -0,0 +1,203 @@
+<?php
+namespace Consolidation\SiteAlias;
+
+use Consolidation\SiteAlias\Util\YamlDataFileLoader;
+use PHPUnit\Framework\TestCase;
+use Symfony\Component\Yaml\Yaml;
+
+class SiteAliasManagerTest extends TestCase
+{
+    use FixtureFactory;
+
+    protected $manager;
+
+    /**
+     * Set up for tests
+     */
+    public function setUp()
+    {
+        $root = $this->siteDir();
+        $referenceData = [];
+        $siteAliasFixtures = $this->fixturesDir() . '/sitealiases/sites';
+
+        $aliasLoader = new SiteAliasFileLoader();
+        $ymlLoader = new YamlDataFileLoader();
+        $aliasLoader->addLoader('yml', $ymlLoader);
+
+        $this->manager = new SiteAliasManager($aliasLoader, $root);
+        $this->manager
+            ->setReferenceData($referenceData)
+            ->addSearchLocation($siteAliasFixtures);
+    }
+
+    public function managerGetTestValues()
+    {
+        return [
+            [
+                '@single.other', false,
+            ],
+
+            [
+                '@other.single.other', false,
+            ],
+
+            [
+                '@single.dev', 'foo: bar
+root: /path/to/single',
+            ],
+
+        ];
+    }
+
+    public function managerGetWithOtherLocationTestValues()
+    {
+        return [
+            [
+                '@single.other', false,
+            ],
+
+            [
+                '@other.single.other', 'foo: baz
+root: /other/other/path/to/single',
+            ],
+
+            [
+                '@single.dev', 'foo: bar
+root: /path/to/single',
+            ],
+
+        ];
+    }
+
+    public function managerGetWithDupLocationsTestValues()
+    {
+        return [
+            [
+                '@single.dev', 'foo: bar
+root: /path/to/single',
+            ],
+
+            [
+                '@other.single.dev', 'foo: baz
+root: /other/path/to/single',
+            ],
+
+            [
+                '@dup.single.dev', 'foo: dup
+root: /dup/path/to/single',
+            ],
+
+        ];
+    }
+
+    /**
+     * This test is just to ensure that our fixture data is being loaded
+     * accurately so that we can start writing tests. Its okay to remove
+     * rather than maintain this test once the suite is mature.
+     */
+    public function testGetMultiple()
+    {
+        // First set of tests: get all aliases in the default location
+
+        $all = $this->manager->getMultiple();
+        $allNames = array_keys($all);
+        sort($allNames);
+
+        $this->assertEquals('@single.alternate,@single.dev,@wild.*,@wild.dev', implode(',', $allNames));
+
+        $all = $this->manager->getMultiple('@single');
+        $allNames = array_keys($all);
+        sort($allNames);
+
+        $this->assertEquals('@single.alternate,@single.dev', implode(',', $allNames));
+
+        // Next set of tests: Get all aliases in the 'other' location
+
+        $this->addAlternateLocation('other');
+
+        $all = $this->manager->getMultiple();
+        $allNames = array_keys($all);
+        sort($allNames);
+
+        $this->assertEquals('@other.single.dev,@other.single.other,@single.alternate,@single.dev,@wild.*,@wild.dev', implode(',', $allNames));
+
+        $all = $this->manager->getMultiple('@other');
+        $allNames = array_keys($all);
+        sort($allNames);
+
+        $this->assertEquals('@other.single.dev,@other.single.other', implode(',', $allNames));
+
+        // Add the 'dup' location and do some more tests
+
+        $this->addAlternateLocation('dup');
+
+        $all = $this->manager->getMultiple();
+        $allNames = array_keys($all);
+        sort($allNames);
+
+        $this->assertEquals('@dup.single.alternate,@dup.single.dev,@other.single.dev,@other.single.other,@single.alternate,@single.dev,@wild.*,@wild.dev', implode(',', $allNames));
+
+        $all = $this->manager->getMultiple('@dup');
+        $allNames = array_keys($all);
+        sort($allNames);
+
+        $this->assertEquals('@dup.single.alternate,@dup.single.dev', implode(',', $allNames));
+
+        $all = $this->manager->getMultiple('@other');
+        $allNames = array_keys($all);
+        sort($allNames);
+
+        $this->assertEquals('@other.single.dev,@other.single.other', implode(',', $allNames));
+    }
+
+    /**
+     * @dataProvider managerGetTestValues
+     */
+    public function testGet(
+        $aliasName,
+        $expected)
+    {
+        $alias = $this->manager->get($aliasName);
+        $actual = $this->renderAlias($alias);
+        $this->assertEquals($expected, $actual);
+    }
+
+    /**
+     * @dataProvider managerGetWithOtherLocationTestValues
+     */
+    public function testGetWithOtherLocation(
+        $aliasName,
+        $expected)
+    {
+        $this->addAlternateLocation('other');
+        $this->testGet($aliasName, $expected);
+    }
+
+    /**
+     * @dataProvider managerGetWithDupLocationsTestValues
+     */
+    public function testGetWithDupLocations(
+        $aliasName,
+        $expected)
+    {
+        $this->addAlternateLocation('dup');
+        $this->testGetWithOtherLocation($aliasName, $expected);
+    }
+
+    protected function addAlternateLocation($fixtureDirName)
+    {
+        // Add another search location IN ADDITION to the one
+        // already added in the setup() mehtod.
+        $siteAliasFixtures = $this->fixturesDir() . '/sitealiases/' . $fixtureDirName;
+        $this->manager->addSearchLocation($siteAliasFixtures);
+    }
+
+    protected function renderAlias($alias)
+    {
+        if (!$alias) {
+            return false;
+        }
+
+        return trim(Yaml::Dump($alias->export()));
+    }
+}
diff --git a/tests/fixtures/sitealiases/dup/single.site.yml b/tests/fixtures/sitealiases/dup/single.site.yml
new file mode 100644
index 0000000..eb4634b
--- /dev/null
+++ b/tests/fixtures/sitealiases/dup/single.site.yml
@@ -0,0 +1,8 @@
+default: dev
+dev:
+  root: /dup/path/to/single
+alternate:
+  root: /dup/alternate/path/to/single
+common:
+  foo: dup
+