diff --git a/Business/Finance/Depreciation.php b/Business/Finance/Depreciation.php
index cc0fd25b3..b6f89b96e 100644
--- a/Business/Finance/Depreciation.php
+++ b/Business/Finance/Depreciation.php
@@ -17,5 +17,51 @@ namespace phpOMS\Business\Finance;
 
 class Depreciation
 {
+    public static function getLinearDepreciationRate(float $start, int $duration) : float
+    {
+        return $start / $duration;
+    }
 
+    public static function getLinearDepreciationResidualInT(float $start, int $duration, int $t) : float
+    {
+        return $start - self::getLinearDepreciationRate($start, $duration) * $t;
+    }
+
+    public static function getArithmeticProgressivDepreciationRate(float $start, int $duration) : float
+    {
+        return $start / ($duration * ($duration+1) / 2);
+    }
+
+    public static function getArithmeticProgressivDepreciationInT(float $start, int $duration, int $t) : float
+    {
+        return $t * self::getArithmeticProgressivDepreciationRate($start, $duration);
+    }
+
+    public static function getArithmeticProgressivDepreciationResidualInT(float $start, int $duration, int $t) : float
+    {
+        return $start - self::getArithmeticProgressivDepreciationRate($start, $duration) * $t * ($t + 1) / 2;
+    }
+
+    public static function getGeometicProgressivDepreciationRate(float $start, float $residual, int $duration) : float
+    {
+        return (1-pow($residual / $start, 1 / $duration));
+    }
+
+    public static function getGeometicDegressivDepreciationInT(float $start, float $residual, int $duration, int $t) : float
+    {
+        return $start * (1 - self::getGeometicDegressivDepreciationRate($start, $residual, $duration)) ** $t;
+    }
+
+    public static function getGeometicDegressivDepreciationResidualInT(float $start, float $residual, int $duration, int $t) : float
+    {
+    }
+
+    public static function getGeometicProgressivDepreciationInT(float $start, float $residual, int $duration, int $t) : float
+    {
+        return $start * (1 - self::getGeometicProgressivDepreciationRate($start, $residual, $duration)) ** ($duration - $t + 1);
+    }
+
+    public static function getGeometicProgressivDepreciationResidualInT(float $start, float $residual, int $duration, int $t) : float
+    {
+    }
 }
\ No newline at end of file
diff --git a/Business/Programming/Metrics.php b/Business/Programming/Metrics.php
index fd461d7b4..3801affb2 100644
--- a/Business/Programming/Metrics.php
+++ b/Business/Programming/Metrics.php
@@ -40,4 +40,22 @@ class Metrics {
     {
         return (int) sqrt($a*$a+$b*$b+$c*$c);
     }
+
+    /**
+     * Calculate the C.R.A.P score
+     *
+     * @latex  r = \sqrt{a^{2} + b^{2} + c^{2}}
+     *
+     * @param int $a Assignments
+     * @param int $b Branches
+     * @param int $c Conditionals
+     *
+     * @return int
+     *
+     * @since  1.0.0
+     */
+    public static function CRAP(int $complexity, float $coverage) : int
+    {
+        return (int) ($complexity ** 2 * (1 - $coverage) ** 3 + $complexity);
+    }
 }
\ No newline at end of file
diff --git a/DataStorage/Database/Exception/InvalidConnectionConfigException.php b/DataStorage/Database/Exception/InvalidConnectionConfigException.php
index c56ddff3e..5b1a3cef7 100644
--- a/DataStorage/Database/Exception/InvalidConnectionConfigException.php
+++ b/DataStorage/Database/Exception/InvalidConnectionConfigException.php
@@ -24,7 +24,7 @@ namespace phpOMS\DataStorage\Database\Exception;
  * @link       http://orange-management.com
  * @since      1.0.0
  */
-class InvalidConnectionConfigException extends \RuntimeException
+class InvalidConnectionConfigException extends \InvalidArgumentException
 {
     /**
      * Constructor.