diff --git a/PHPSkills/TrueSkill/Factors/GaussianWeightedSumFactor.php b/PHPSkills/TrueSkill/Factors/GaussianWeightedSumFactor.php
index 3e221f5..d1f18e9 100644
--- a/PHPSkills/TrueSkill/Factors/GaussianWeightedSumFactor.php
+++ b/PHPSkills/TrueSkill/Factors/GaussianWeightedSumFactor.php
@@ -63,13 +63,11 @@ class GaussianWeightedSumFactor extends GaussianFactor
         for ($weightsIndex = 1; $weightsIndex < $weightsLength; $weightsIndex++)
         { 
             $currentWeights = array();
-            $this->_weights[$weightsIndex] = &$currentWeights;
-
+            
             $variableIndices = array();
             $variableIndices[0] = $weightsIndex;
 
             $currentWeightsSquared = array();
-            $this->_weightsSquared[$weightsIndex] = &$currentWeightsSquared;
 
             // keep a single variable to keep track of where we are in the array.
             // This is helpful since we skip over one of the spots
@@ -112,7 +110,10 @@ class GaussianWeightedSumFactor extends GaussianFactor
             $currentWeights[$currentDestinationWeightIndex] = $finalWeight;
             $currentWeightsSquared[$currentDestinationWeightIndex] = square($finalWeight);
             $variableIndices[count($variableWeights)] = 0;
-            $this->_variableIndexOrdersForWeights[] = &$variableIndices;
+            $this->_variableIndexOrdersForWeights[] = $variableIndices;
+
+            $this->_weights[$weightsIndex] = $currentWeights;
+            $this->_weightsSquared[$weightsIndex] = $currentWeightsSquared;
         }
 
         $this->createVariableToMessageBinding($sumVariable);
diff --git a/PHPSkills/TrueSkill/Layers/TeamPerformancesToTeamPerformanceDifferencesLayer.php b/PHPSkills/TrueSkill/Layers/TeamPerformancesToTeamPerformanceDifferencesLayer.php
index 78753a7..132c23f 100644
--- a/PHPSkills/TrueSkill/Layers/TeamPerformancesToTeamPerformanceDifferencesLayer.php
+++ b/PHPSkills/TrueSkill/Layers/TeamPerformancesToTeamPerformanceDifferencesLayer.php
@@ -29,7 +29,7 @@ class TeamPerformancesToTeamPerformanceDifferencesLayer extends TrueSkillFactorG
             $weakerTeam = $inputVariablesGroups[$i + 1][0];
 
             $currentDifference = &$this->createOutputVariable();
-            $newDifferencesFactor = &$this->createTeamPerformanceToDifferenceFactor($strongerTeam, $weakerTeam, $currentDifference);
+            $newDifferencesFactor = $this->createTeamPerformanceToDifferenceFactor($strongerTeam, $weakerTeam, $currentDifference);
             $this->addLayerFactor($newDifferencesFactor);
 
             // REVIEW: Does it make sense to have groups of one?
diff --git a/PHPSkills/TrueSkill/TrueSkillFactorGraph.php b/PHPSkills/TrueSkill/TrueSkillFactorGraph.php
index 9330e09..69f07fc 100644
--- a/PHPSkills/TrueSkill/TrueSkillFactorGraph.php
+++ b/PHPSkills/TrueSkill/TrueSkillFactorGraph.php
@@ -3,6 +3,7 @@ namespace Moserware\Skills\TrueSkill;
 
 require_once(dirname(__FILE__) . '/../GameInfo.php');
 require_once(dirname(__FILE__) . '/../Rating.php');
+require_once(dirname(__FILE__) . '/../RatingContainer.php');
 require_once(dirname(__FILE__) . '/../FactorGraphs/FactorGraph.php');
 require_once(dirname(__FILE__) . '/../FactorGraphs/FactorList.php');
 require_once(dirname(__FILE__) . '/../FactorGraphs/Schedule.php');
@@ -18,6 +19,7 @@ require_once(dirname(__FILE__) . '/Layers/TeamPerformancesToTeamPerformanceDiffe
 use Moserware\Numerics\GaussianDistribution;
 use Moserware\Skills\GameInfo;
 use Moserware\Skills\Rating;
+use Moserware\Skills\RatingContainer;
 use Moserware\Skills\FactorGraphs\FactorGraph;
 use Moserware\Skills\FactorGraphs\FactorList;
 use Moserware\Skills\FactorGraphs\ScheduleSequence;
@@ -130,14 +132,16 @@ class TrueSkillFactorGraph extends FactorGraph
 
     public function getUpdatedRatings()
     {
-        $result = array();
+        $result = new RatingContainer();
 
         foreach ($this->_priorLayer->getOutputVariablesGroups() as $currentTeam)
         {
             foreach ($currentTeam as $currentPlayer)
             {
-                $result[$currentPlayer->getKey()] = new Rating($currentPlayer->getValue()->getMean(),
-                                                               $currentPlayer->getValue()->getStandardDeviation());
+                $newRating = new Rating($currentPlayer->getValue()->getMean(),
+                                        $currentPlayer->getValue()->getStandardDeviation());
+
+                $result->setRating($currentPlayer, $newRating);
             }
         }