diff --git a/app/code/core/Mage/Api2/Model/Acl/Global/Role.php b/app/code/core/Mage/Api2/Model/Acl/Global/Role.php
index 3cd30544863..58c6a7b0926 100644
--- a/app/code/core/Mage/Api2/Model/Acl/Global/Role.php
+++ b/app/code/core/Mage/Api2/Model/Acl/Global/Role.php
@@ -80,7 +80,7 @@ protected function _beforeSave()
         }
 
         //check and protect guest role
-        if (Mage_Api2_Model_Acl_Global_Role::isSystemRole($this)
+        if (self::isSystemRole($this)
             && $this->getRoleName() != $this->getOrigData('role_name')) {
 
             /** @var Mage_Core_Helper_Data $helper */
@@ -102,7 +102,7 @@ protected function _beforeSave()
      */
     protected function _beforeDelete()
     {
-        if (Mage_Api2_Model_Acl_Global_Role::isSystemRole($this)) {
+        if (self::isSystemRole($this)) {
             /** @var Mage_Core_Helper_Data $helper */
             $helper = Mage::helper('core');
 
diff --git a/app/code/core/Mage/Api2/Model/Resource.php b/app/code/core/Mage/Api2/Model/Resource.php
index 1247805e158..b885c8e990d 100644
--- a/app/code/core/Mage/Api2/Model/Resource.php
+++ b/app/code/core/Mage/Api2/Model/Resource.php
@@ -736,7 +736,7 @@ final protected function _applyCollectionModifiers(Varien_Data_Collection_Db $co
         $orderField = $this->getRequest()->getOrderField();
 
         if ($orderField !== null) {
-            $operation = Mage_Api2_Model_Resource::OPERATION_ATTRIBUTE_READ;
+            $operation = self::OPERATION_ATTRIBUTE_READ;
             if (!is_string($orderField)
                 || !array_key_exists($orderField, $this->getAvailableAttributes($this->getUserType(), $operation))
             ) {
diff --git a/app/code/core/Mage/Captcha/Helper/Data.php b/app/code/core/Mage/Captcha/Helper/Data.php
index 7a97c2ee3f5..324ffbbbe33 100644
--- a/app/code/core/Mage/Captcha/Helper/Data.php
+++ b/app/code/core/Mage/Captcha/Helper/Data.php
@@ -103,7 +103,7 @@ public function getConfigNode($id, $store = null)
      */
     public function getFonts()
     {
-        $node = Mage::getConfig()->getNode(Mage_Captcha_Helper_Data::XML_PATH_CAPTCHA_FONTS);
+        $node = Mage::getConfig()->getNode(self::XML_PATH_CAPTCHA_FONTS);
         $fonts = [];
         if ($node) {
             foreach ($node->children() as $fontName => $fontNode) {
diff --git a/app/code/core/Mage/Core/Model/Locale.php b/app/code/core/Mage/Core/Model/Locale.php
index af4406d4dfd..7aabc24a8b6 100644
--- a/app/code/core/Mage/Core/Model/Locale.php
+++ b/app/code/core/Mage/Core/Model/Locale.php
@@ -576,7 +576,7 @@ public function utcDate($store, $date, $includeTime = false, $format = null)
     {
         $dateObj = $this->storeDate($store, $date, $includeTime);
         $dateObj->set($date, $format);
-        $dateObj->setTimezone(Mage_Core_Model_Locale::DEFAULT_TIMEZONE);
+        $dateObj->setTimezone(self::DEFAULT_TIMEZONE);
         return $dateObj;
     }
 
diff --git a/app/code/core/Mage/Core/Model/Store.php b/app/code/core/Mage/Core/Model/Store.php
index 737311f628c..5a6ed8ef45a 100644
--- a/app/code/core/Mage/Core/Model/Store.php
+++ b/app/code/core/Mage/Core/Model/Store.php
@@ -825,8 +825,8 @@ public function isCurrentlySecure()
      */
     public function getBaseCurrencyCode()
     {
-        $configValue = $this->getConfig(Mage_Core_Model_Store::XML_PATH_PRICE_SCOPE);
-        if ($configValue == Mage_Core_Model_Store::PRICE_SCOPE_GLOBAL) {
+        $configValue = $this->getConfig(self::XML_PATH_PRICE_SCOPE);
+        if ($configValue == self::PRICE_SCOPE_GLOBAL) {
             return Mage::app()->getBaseCurrencyCode();
         } else {
             return $this->getConfig(Mage_Directory_Model_Currency::XML_PATH_CURRENCY_BASE);
@@ -1174,7 +1174,7 @@ public function getCurrentUrl($fromStore = true)
             $storeParsedQuery[$k] = $v;
         }
 
-        if (!Mage::getStoreConfigFlag(Mage_Core_Model_Store::XML_PATH_STORE_IN_URL, $this->getCode())) {
+        if (!Mage::getStoreConfigFlag(self::XML_PATH_STORE_IN_URL, $this->getCode())) {
             $storeParsedQuery['___store'] = $this->getCode();
         }
         if ($fromStore !== false) {
diff --git a/app/code/core/Mage/Directory/Model/Currency.php b/app/code/core/Mage/Directory/Model/Currency.php
index 07d570dd306..359b5fcda86 100644
--- a/app/code/core/Mage/Directory/Model/Currency.php
+++ b/app/code/core/Mage/Directory/Model/Currency.php
@@ -131,7 +131,7 @@ public function getRate($toCurrency)
     {
         if (is_string($toCurrency)) {
             $code = $toCurrency;
-        } elseif ($toCurrency instanceof Mage_Directory_Model_Currency) {
+        } elseif ($toCurrency instanceof self) {
             $code = $toCurrency->getCurrencyCode();
         } else {
             throw Mage::exception('Mage_Directory', Mage::helper('directory')->__('Invalid target currency.'));
diff --git a/app/code/core/Mage/ImportExport/Model/Import/Entity/Product.php b/app/code/core/Mage/ImportExport/Model/Import/Entity/Product.php
index a999884c61a..6a3a6405d65 100644
--- a/app/code/core/Mage/ImportExport/Model/Import/Entity/Product.php
+++ b/app/code/core/Mage/ImportExport/Model/Import/Entity/Product.php
@@ -1472,12 +1472,12 @@ protected function _saveProducts()
                     $previousType = $productType;
                 }
                 if (isset($rowData[self::COL_ATTR_SET]) && !is_null($rowData[self::COL_ATTR_SET])) {
-                    $previousAttributeSet = $rowData[Mage_ImportExport_Model_Import_Entity_Product::COL_ATTR_SET];
+                    $previousAttributeSet = $rowData[self::COL_ATTR_SET];
                 }
                 if (self::SCOPE_NULL == $rowScope) {
                     // for multiselect attributes only
                     if (!is_null($previousAttributeSet)) {
-                        $rowData[Mage_ImportExport_Model_Import_Entity_Product::COL_ATTR_SET] = $previousAttributeSet;
+                        $rowData[self::COL_ATTR_SET] = $previousAttributeSet;
                     }
                     if (is_null($productType) && !is_null($previousType)) {
                         $productType = $previousType;
diff --git a/app/code/core/Mage/Oauth/Model/Token.php b/app/code/core/Mage/Oauth/Model/Token.php
index bcc0d435db9..345e4744f8d 100644
--- a/app/code/core/Mage/Oauth/Model/Token.php
+++ b/app/code/core/Mage/Oauth/Model/Token.php
@@ -145,7 +145,7 @@ public function authorize($userId, $userType)
      */
     public function convertToAccess()
     {
-        if (Mage_Oauth_Model_Token::TYPE_REQUEST != $this->getType()) {
+        if (self::TYPE_REQUEST != $this->getType()) {
             Mage::throwException('Can not convert due to token is not request type');
         }
         /** @var Mage_Oauth_Helper_Data $helper */
diff --git a/app/code/core/Mage/Paypal/Model/Express/Checkout.php b/app/code/core/Mage/Paypal/Model/Express/Checkout.php
index 2f7576619a1..7132bdcc16e 100644
--- a/app/code/core/Mage/Paypal/Model/Express/Checkout.php
+++ b/app/code/core/Mage/Paypal/Model/Express/Checkout.php
@@ -404,7 +404,7 @@ public function start($returnUrl, $cancelUrl, $button = null)
     public function canSkipOrderReviewStep()
     {
         $isOnepageCheckout = !$this->_quote->getPayment()
-            ->getAdditionalInformation(Mage_Paypal_Model_Express_Checkout::PAYMENT_INFO_BUTTON);
+            ->getAdditionalInformation(self::PAYMENT_INFO_BUTTON);
         return $this->_config->isOrderReviewStepDisabled() && $isOnepageCheckout;
     }
 
@@ -619,8 +619,8 @@ public function place($token, $shippingMethodCode = null)
 
         // commence redirecting to finish payment, if paypal requires it
         if ($order->getPayment()->getAdditionalInformation(
-            Mage_Paypal_Model_Express_Checkout::PAYMENT_INFO_TRANSPORT_REDIRECT
-            )) {
+            self::PAYMENT_INFO_TRANSPORT_REDIRECT
+        )) {
             $this->_redirectUrl = $this->_config->getExpressCheckoutCompleteUrl($token);
         }
 
diff --git a/app/code/core/Mage/PaypalUk/Model/Pro.php b/app/code/core/Mage/PaypalUk/Model/Pro.php
index 4060610d4f3..904c7dfda55 100644
--- a/app/code/core/Mage/PaypalUk/Model/Pro.php
+++ b/app/code/core/Mage/PaypalUk/Model/Pro.php
@@ -86,7 +86,7 @@ protected function _getParentTransactionId(Varien_Object $payment)
     {
         if ($payment->getParentTransactionId()) {
             return $payment->getTransaction($payment->getParentTransactionId())
-                ->getAdditionalInformation(Mage_PaypalUk_Model_Pro::TRANSPORT_PAYFLOW_TXN_ID);
+                ->getAdditionalInformation(self::TRANSPORT_PAYFLOW_TXN_ID);
         }
         return $payment->getParentTransactionId();
     }
@@ -102,7 +102,7 @@ protected function _importCaptureResultToPayment($api, $payment)
         $payment->setTransactionId($api->getPaypalTransactionId())
             ->setIsTransactionClosed(false)
             ->setTransactionAdditionalInfo(
-                Mage_PaypalUk_Model_Pro::TRANSPORT_PAYFLOW_TXN_ID,
+                self::TRANSPORT_PAYFLOW_TXN_ID,
                 $api->getTransactionId()
             );
         $payment->setPreparedMessage(
@@ -139,7 +139,7 @@ protected function _importRefundResultToPayment($api, $payment, $canRefundMore)
             ->setIsTransactionClosed(1) // refund initiated by merchant
             ->setShouldCloseParentTransaction(!$canRefundMore)
             ->setTransactionAdditionalInfo(
-                Mage_PaypalUk_Model_Pro::TRANSPORT_PAYFLOW_TXN_ID,
+                self::TRANSPORT_PAYFLOW_TXN_ID,
                 $api->getTransactionId()
             );
         $payment->setPreparedMessage(
diff --git a/app/code/core/Mage/Persistent/Model/Session.php b/app/code/core/Mage/Persistent/Model/Session.php
index 245f1043a2c..74e1703f7f3 100644
--- a/app/code/core/Mage/Persistent/Model/Session.php
+++ b/app/code/core/Mage/Persistent/Model/Session.php
@@ -154,7 +154,7 @@ protected function _afterLoad()
     public function loadByCookieKey($key = null)
     {
         if (is_null($key)) {
-            $key = Mage::getSingleton('core/cookie')->get(Mage_Persistent_Model_Session::COOKIE_NAME);
+            $key = Mage::getSingleton('core/cookie')->get(self::COOKIE_NAME);
         }
         if ($key) {
             $this->load($key, 'key');
@@ -197,7 +197,7 @@ public function deleteByCustomerId($customerId, $clearCookie = true)
      */
     public function removePersistentCookie()
     {
-        Mage::getSingleton('core/cookie')->delete(Mage_Persistent_Model_Session::COOKIE_NAME);
+        Mage::getSingleton('core/cookie')->delete(self::COOKIE_NAME);
         return $this;
     }
 
diff --git a/app/code/core/Mage/Sales/Model/Quote/Address.php b/app/code/core/Mage/Sales/Model/Quote/Address.php
index 00f1a61b2fd..f11f2f15699 100644
--- a/app/code/core/Mage/Sales/Model/Quote/Address.php
+++ b/app/code/core/Mage/Sales/Model/Quote/Address.php
@@ -370,7 +370,7 @@ protected function _populateBeforeSaveData()
      */
     protected function _isSameAsBilling()
     {
-        return ($this->getAddressType() == Mage_Sales_Model_Quote_Address::TYPE_SHIPPING
+        return ($this->getAddressType() === self::TYPE_SHIPPING
             && ($this->_isNotRegisteredCustomer() || $this->_isDefaultShippingNullOrSameAsBillingAddress()));
     }
 
diff --git a/app/code/core/Mage/SalesRule/Helper/Coupon.php b/app/code/core/Mage/SalesRule/Helper/Coupon.php
index b4c1ae256c5..b4b0e67bf33 100644
--- a/app/code/core/Mage/SalesRule/Helper/Coupon.php
+++ b/app/code/core/Mage/SalesRule/Helper/Coupon.php
@@ -139,6 +139,6 @@ public function getCharset($format)
      */
     public function getCodeSeparator()
     {
-        return (string)Mage::app()->getConfig()->getNode(Mage_SalesRule_Helper_Coupon::XML_CHARSET_SEPARATOR);
+        return (string)Mage::app()->getConfig()->getNode(self::XML_CHARSET_SEPARATOR);
     }
 }
diff --git a/app/code/core/Mage/SalesRule/Model/Rule.php b/app/code/core/Mage/SalesRule/Model/Rule.php
index 48fd0ea75d7..c416c528614 100644
--- a/app/code/core/Mage/SalesRule/Model/Rule.php
+++ b/app/code/core/Mage/SalesRule/Model/Rule.php
@@ -377,8 +377,8 @@ public function getCouponTypes()
     {
         if ($this->_couponTypes === null) {
             $this->_couponTypes = [
-                Mage_SalesRule_Model_Rule::COUPON_TYPE_NO_COUPON => Mage::helper('salesrule')->__('No Coupon'),
-                Mage_SalesRule_Model_Rule::COUPON_TYPE_SPECIFIC  => Mage::helper('salesrule')->__('Specific Coupon'),
+                self::COUPON_TYPE_NO_COUPON => Mage::helper('salesrule')->__('No Coupon'),
+                self::COUPON_TYPE_SPECIFIC  => Mage::helper('salesrule')->__('Specific Coupon'),
             ];
             $transport = new Varien_Object([
                 'coupon_types'                => $this->_couponTypes,
@@ -387,7 +387,7 @@ public function getCouponTypes()
             Mage::dispatchEvent('salesrule_rule_get_coupon_types', ['transport' => $transport]);
             $this->_couponTypes = $transport->getCouponTypes();
             if ($transport->getIsCouponTypeAutoVisible()) {
-                $this->_couponTypes[Mage_SalesRule_Model_Rule::COUPON_TYPE_AUTO] = Mage::helper('salesrule')->__('Auto');
+                $this->_couponTypes[self::COUPON_TYPE_AUTO] = Mage::helper('salesrule')->__('Auto');
             }
         }
         return $this->_couponTypes;