diff --git a/framework/validators/BooleanValidator.php b/framework/validators/BooleanValidator.php
index 427fa44..7a7b68f 100644
--- a/framework/validators/BooleanValidator.php
+++ b/framework/validators/BooleanValidator.php
@@ -60,6 +60,15 @@ class BooleanValidator extends Validator
 		}
 	}
 
+	public function validateValue($value)
+	{
+		if ($this->allowEmpty && $this->isEmpty($value)) {
+			return;
+		}
+		return ($this->strict || $value == $this->trueValue || $value == $this->falseValue)
+				&& (!$this->strict || $value === $this->trueValue || $value === $this->falseValue);
+	}
+
 	/**
 	 * Returns the JavaScript needed for performing client-side validation.
 	 * @param \yii\base\Model $object the data object being validated
diff --git a/framework/validators/Validator.php b/framework/validators/Validator.php
index b688f32..00a88ba 100644
--- a/framework/validators/Validator.php
+++ b/framework/validators/Validator.php
@@ -8,6 +8,7 @@
 namespace yii\validators;
 
 use yii\base\Component;
+use yii\base\NotSupportedException;
 
 /**
  * Validator is the base class for all validators.
@@ -81,7 +82,7 @@ abstract class Validator extends Component
 	 */
 	public $message;
 	/**
-	 * @var array list of scenarios that the validator should be applied.
+	 * @var array list of scenarios that the validator can be applied to.
 	 */
 	public $on = array();
 	/**
@@ -174,6 +175,11 @@ abstract class Validator extends Component
 		}
 	}
 
+	public function validateValue($value)
+	{
+		throw new NotSupportedException(__CLASS__ . ' does not support validateValue().');
+	}
+
 	/**
 	 * Returns the JavaScript needed for performing client-side validation.
 	 *