diff --git a/src/Application.php b/src/Application.php
index eab28e0818..898cf32484 100644
--- a/src/Application.php
+++ b/src/Application.php
@@ -30,7 +30,7 @@ public function __construct($name, $version)
         //   --alias-path
         //   --local
         //
-        // Global options registerd with Symfony:
+        // Global options registered with Symfony:
         //
         //   --remote-host
         //   --remote-user
@@ -43,6 +43,10 @@ public function __construct($name, $version)
         //   --verbose / -v
         //   --help
         //   --quiet
+        //   --debug / -d : equivalent to -vv
+        //   --yes / -y : equivalent to --no-interaction
+        //   --nocolor  : equivalent to --no-ansi
+        //
         //
         // No longer supported
         //
@@ -54,15 +58,13 @@ public function __construct($name, $version)
         //   --strict            Not supported by Symfony
         //   --interactive       If command isn't -n, then it is interactive
         //   --command-specific  Now handled by consolidation/config component
-        //
+        //   --php               If needed prefix command with PATH=/path/to/php:$PATH. Also see #env_vars in site aliases.
+        //   --php-options
+        //   --pipe
         // Not handled yet (to be implemented):
         //
-        //   --debug / -d
+
         //   --uri / -l
-        //   --yes / -y
-        //   --pipe
-        //   --php
-        //   --php-options
         //   --tty
         //   --exclude
         //   --backend
@@ -70,7 +72,6 @@ public function __construct($name, $version)
         //   --ignored-modules
         //   --no-label
         //   --label-separator
-        //   --nocolor
         //   --cache-default-class
         //   --cache-class-<bin>
         //   --confirm-rollback
@@ -86,6 +87,17 @@ public function __construct($name, $version)
         //   --path-aliases
         //   --ssh-options
 
+
+        $this->getDefinition()
+            ->addOption(
+                new InputOption('--debug', 'd', InputOption::VALUE_NONE, 'Equivalent to -vv')
+            );
+
+        $this->getDefinition()
+            ->addOption(
+                new InputOption('--yes', 'y', InputOption::VALUE_NONE, 'Equivalent to --no-interaction.')
+            );
+
         $this->getDefinition()
             ->addOption(
                 new InputOption('--remote-host', null, InputOption::VALUE_REQUIRED, 'Run on a remote server.')
diff --git a/src/Preflight/Preflight.php b/src/Preflight/Preflight.php
index 792cab74d1..0a82bd80d5 100644
--- a/src/Preflight/Preflight.php
+++ b/src/Preflight/Preflight.php
@@ -14,6 +14,7 @@
 use Symfony\Component\Console\Input\ArgvInput;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Input\StringInput;
+use Symfony\Component\Console\Output\Output;
 use Symfony\Component\Console\Output\OutputInterface;
 
 use Webmozart\PathUtil\Path;
@@ -199,6 +200,15 @@ protected function doRun($argv)
         $runner = new \Robo\Runner();
         $runner->registerCommandClasses($application, $commandClasses);
 
+        // Process legacy Drush global options.
+        if ($input->getParameterOption(['--yes', '-y'], false, true)) {
+            $input->setInteractive(false);
+        }
+        // Use -vvv for even more verbose logging.
+        if ($input->getParameterOption(['--debug', '-d'], false, true)) {
+            $output->setVerbosity(Output::VERBOSITY_DEBUG);
+        }
+
         // Run the Symfony Application
         // Predispatch: call a remote Drush command if applicable (via a 'pre-init' hook)
         // Bootstrap: bootstrap site to the level requested by the command (via a 'post-init' hook)
diff --git a/src/Style/DrushStyle.php b/src/Style/DrushStyle.php
index c99399f35b..ff12e83f27 100644
--- a/src/Style/DrushStyle.php
+++ b/src/Style/DrushStyle.php
@@ -26,20 +26,4 @@ public function choice($question, array $choices, $default = null)
             return array_search($return, $choices);
         }
     }
-
-    public function confirm($question, $default = true)
-    {
-        // Automatically accept confirmations if the --yes argument was supplied.
-        if (drush_get_context('DRUSH_AFFIRMATIVE')) {
-            $this->comment($question . ': yes.');
-            return true;
-        } // Automatically cancel confirmations if the --no argument was supplied.
-        elseif (drush_get_context('DRUSH_NEGATIVE')) {
-            $this->warning($question . ': no.');
-            return false;
-        }
-
-        $return = parent::confirm($question, $default);
-        return $return;
-    }
 }