diff --git a/app/PersonTarget.php b/app/PersonTarget.php
index c235608..f16c984 100644
--- a/app/PersonTarget.php
+++ b/app/PersonTarget.php
@@ -31,6 +31,11 @@ class PersonTarget extends Model
         return $this->hasMany('App\SubBooking');
     }
 
+    public function person()
+    {
+        return $this->belongsTo('App\Person');
+    }
+
     /**************************************************************************
      * INDIRECT RELATIONS                                                     *
      **************************************************************************/
@@ -88,6 +93,16 @@ class PersonTarget extends Model
      * COLLECTIONS FILTERED BY PAYMENT STATES                                 *
      **************************************************************************/
 
+    /*
+     * Get all targets which are paid off.
+     *
+     * @return Illuminate\Database\Eloquent\Collection
+     */
+    public static function open()
+    {
+        return PersonTarget::queryWhere('open');
+    }
+    
     /*
      * Get all targets which are paid off.
      *
@@ -162,6 +177,9 @@ class PersonTarget extends Model
             case 'paid':
                 $having = 'target = actual';
                 break;
+            case 'open':
+                $having = 'target != actual';
+                break;
             case 'underpaid':
                 $having = '(target > 0 AND target > actual) OR ' .
                           '(target < 0 AND target < actual)';