diff --git a/wp-admin/includes/class-wp-comments-list-table.php b/wp-admin/includes/class-wp-comments-list-table.php
index ec7711d88..5cab68d04 100644
--- a/wp-admin/includes/class-wp-comments-list-table.php
+++ b/wp-admin/includes/class-wp-comments-list-table.php
@@ -30,7 +30,6 @@ class WP_Comments_List_Table extends WP_List_Table {
 			add_filter( 'comment_author', 'floated_admin_avatar' );
 
 		parent::WP_List_Table( array(
-			'screen' => 'edit-comments',
 			'plural' => 'comments'
 		) );
 	}
diff --git a/wp-admin/includes/class-wp-links-list-table.php b/wp-admin/includes/class-wp-links-list-table.php
index cfff1bffd..09e3e5f83 100644
--- a/wp-admin/includes/class-wp-links-list-table.php
+++ b/wp-admin/includes/class-wp-links-list-table.php
@@ -10,7 +10,6 @@ class WP_Links_List_Table extends WP_List_Table {
 
 	function WP_Links_List_Table() {
 		parent::WP_List_Table( array(
-			'screen' => 'link-manager',
 			'plural' => 'bookmarks',
 		) );
 	}
@@ -189,4 +188,4 @@ class WP_Links_List_Table extends WP_List_Table {
 	}
 }
 
-?>
\ No newline at end of file
+?>
diff --git a/wp-admin/includes/class-wp-list-table.php b/wp-admin/includes/class-wp-list-table.php
index 25d827778..e164a0154 100644
--- a/wp-admin/includes/class-wp-list-table.php
+++ b/wp-admin/includes/class-wp-list-table.php
@@ -76,9 +76,9 @@ class WP_List_Table {
 	 * @param array $args An associative array with information about the current table
 	 * @access protected
 	 */
-	function WP_List_Table( $args ) {
+	function WP_List_Table( $args = array() ) {
 		$args = wp_parse_args( $args, array(
-			'screen' => '',
+			'screen' => get_current_screen(),
 			'plural' => '',
 			'singular' => '',
 			'ajax' => true
@@ -632,9 +632,7 @@ class WP_List_Table {
 	 * @return array
 	 */
 	function get_table_classes() {
-		extract( $this->_args );
-
-		return array( 'widefat', 'fixed', $plural );
+		return array( 'widefat', 'fixed', $this->_args['plural'] );
 	}
 
 	/**
@@ -807,13 +805,12 @@ class WP_List_Table {
 	 * @access private
 	 */
 	function _js_vars() {
-		extract( $this->_args );
-
-		$class = get_class( $this );
-
-		printf( "<script type='text/javascript'>list_args = %s;</script>\n",
-			json_encode( compact( 'screen', 'class' ) )
+		$args = array(
+			'class' => get_class( $this ),
+			'screen' => $this->_screen
 		);
+
+		printf( "<script type='text/javascript'>list_args = %s;</script>\n", json_encode( $args ) );
 	}
 }
 ?>
diff --git a/wp-admin/includes/class-wp-ms-sites-list-table.php b/wp-admin/includes/class-wp-ms-sites-list-table.php
index 629750117..ad937342f 100644
--- a/wp-admin/includes/class-wp-ms-sites-list-table.php
+++ b/wp-admin/includes/class-wp-ms-sites-list-table.php
@@ -10,7 +10,6 @@ class WP_MS_Sites_List_Table extends WP_List_Table {
 
 	function WP_MS_Sites_List_Table() {
 		parent::WP_List_Table( array(
-			'screen' => 'sites-network',
 			'plural' => 'sites',
 		) );
 	}
@@ -330,4 +329,4 @@ class WP_MS_Sites_List_Table extends WP_List_Table {
 	}
 }
 
-?>
\ No newline at end of file
+?>
diff --git a/wp-admin/includes/class-wp-ms-themes-list-table.php b/wp-admin/includes/class-wp-ms-themes-list-table.php
index 3b421e883..6a5d5d8fc 100644
--- a/wp-admin/includes/class-wp-ms-themes-list-table.php
+++ b/wp-admin/includes/class-wp-ms-themes-list-table.php
@@ -23,7 +23,6 @@ class WP_MS_Themes_List_Table extends WP_List_Table {
 		$page = $this->get_pagenum();
 
 		parent::WP_List_Table( array(
-			'screen' => 'themes',
 			'plural' => 'plugins', // @todo replace with themes and add css
 		) );
 	}
diff --git a/wp-admin/includes/class-wp-ms-users-list-table.php b/wp-admin/includes/class-wp-ms-users-list-table.php
index 45abc6541..1176302b0 100644
--- a/wp-admin/includes/class-wp-ms-users-list-table.php
+++ b/wp-admin/includes/class-wp-ms-users-list-table.php
@@ -10,7 +10,7 @@ class WP_MS_Users_List_Table extends WP_List_Table {
 
 	function WP_MS_Users_List_Table() {
 		parent::WP_List_Table( array(
-			'screen' => 'users-network',
+			'plural' => 'users'
 		) );
 	}
 
@@ -234,4 +234,4 @@ class WP_MS_Users_List_Table extends WP_List_Table {
 	}
 }
 
-?>
\ No newline at end of file
+?>
diff --git a/wp-admin/includes/class-wp-plugin-install-list-table.php b/wp-admin/includes/class-wp-plugin-install-list-table.php
index 9ba365bcc..28a3e105e 100644
--- a/wp-admin/includes/class-wp-plugin-install-list-table.php
+++ b/wp-admin/includes/class-wp-plugin-install-list-table.php
@@ -8,12 +8,6 @@
  */
 class WP_Plugin_Install_List_Table extends WP_List_Table {
 
-	function WP_Plugin_Install_List_Table() {
-		parent::WP_List_Table( array(
-			'screen' => 'plugin-install',
-		) );
-	}
-
 	function check_permissions() {
 		if ( ! current_user_can('install_plugins') )
 			wp_die(__('You do not have sufficient permissions to install plugins on this site.'));
@@ -231,4 +225,4 @@ class WP_Plugin_Install_List_Table extends WP_List_Table {
 	}
 }
 
-?>
\ No newline at end of file
+?>
diff --git a/wp-admin/includes/class-wp-plugins-list-table.php b/wp-admin/includes/class-wp-plugins-list-table.php
index c3b16a04a..2cd922e5b 100644
--- a/wp-admin/includes/class-wp-plugins-list-table.php
+++ b/wp-admin/includes/class-wp-plugins-list-table.php
@@ -23,7 +23,6 @@ class WP_Plugins_List_Table extends WP_List_Table {
 		$page = $this->get_pagenum();
 
 		parent::WP_List_Table( array(
-			'screen' => 'plugins',
 			'plural' => 'plugins',
 		) );
 	}
diff --git a/wp-admin/includes/class-wp-posts-list-table.php b/wp-admin/includes/class-wp-posts-list-table.php
index 1c89534fc..b6a651eb1 100644
--- a/wp-admin/includes/class-wp-posts-list-table.php
+++ b/wp-admin/includes/class-wp-posts-list-table.php
@@ -45,7 +45,7 @@ class WP_Posts_List_Table extends WP_List_Table {
 	var $sticky_posts_count = 0;
 
 	function WP_Posts_List_Table() {
-		global $post_type_object, $post_type, $current_screen, $wpdb;
+		global $post_type_object, $post_type, $wpdb;
 
 		if ( !isset( $_REQUEST['post_type'] ) )
 			$post_type = 'post';
@@ -74,7 +74,6 @@ class WP_Posts_List_Table extends WP_List_Table {
 		}
 
 		parent::WP_List_Table( array(
-			'screen' => $current_screen,
 			'plural' => 'posts',
 		) );
 	}
diff --git a/wp-admin/includes/class-wp-terms-list-table.php b/wp-admin/includes/class-wp-terms-list-table.php
index d355491bc..bbe5a251a 100644
--- a/wp-admin/includes/class-wp-terms-list-table.php
+++ b/wp-admin/includes/class-wp-terms-list-table.php
@@ -11,7 +11,7 @@ class WP_Terms_List_Table extends WP_List_Table {
 	var $callback_args;
 
 	function WP_Terms_List_Table() {
-		global $post_type, $taxonomy, $tax, $current_screen;
+		global $post_type, $taxonomy, $tax;
 
 		wp_reset_vars( array( 'action', 'taxonomy', 'post_type' ) );
 
@@ -26,11 +26,7 @@ class WP_Terms_List_Table extends WP_List_Table {
 		if ( empty( $post_type ) || !in_array( $post_type, get_post_types( array( 'public' => true ) ) ) )
 			$post_type = 'post';
 
-		if ( !isset( $current_screen ) )
-			set_current_screen( 'edit-' . $taxonomy );
-
 		parent::WP_List_Table( array(
-			'screen' => $current_screen,
 			'plural' => 'tags',
 			'singular' => 'tag',
 		) );
@@ -362,4 +358,4 @@ class WP_Terms_List_Table extends WP_List_Table {
 	}
 }
 
-?>
\ No newline at end of file
+?>
diff --git a/wp-admin/includes/class-wp-theme-install-list-table.php b/wp-admin/includes/class-wp-theme-install-list-table.php
index a034552b1..5a25ebdbe 100644
--- a/wp-admin/includes/class-wp-theme-install-list-table.php
+++ b/wp-admin/includes/class-wp-theme-install-list-table.php
@@ -8,12 +8,6 @@
  */
 class WP_Theme_Install_List_Table extends WP_List_Table {
 
-	function WP_Theme_Install_List_Table() {
-		parent::WP_List_Table( array(
-			'screen' => 'theme-install',
-		) );
-	}
-
 	function check_permissions() {
 		if ( ! current_user_can('install_themes') )
 			wp_die( __( 'You do not have sufficient permissions to install themes on this site.' ) );
@@ -184,4 +178,4 @@ class WP_Theme_Install_List_Table extends WP_List_Table {
 	}
 }
 
-?>
\ No newline at end of file
+?>
diff --git a/wp-admin/includes/class-wp-themes-list-table.php b/wp-admin/includes/class-wp-themes-list-table.php
index c39df5aa6..ea5be0b0d 100644
--- a/wp-admin/includes/class-wp-themes-list-table.php
+++ b/wp-admin/includes/class-wp-themes-list-table.php
@@ -11,12 +11,6 @@ class WP_Themes_List_Table extends WP_List_Table {
 	var $search = array();
 	var $features = array();
 
-	function WP_Themes_List_Table() {
-		parent::__construct( array(
-			'screen' => 'themes',
-		) );
-	}
-
 	function check_permissions() {
 		if ( !current_user_can('switch_themes') && !current_user_can('edit_theme_options') )
 			wp_die( __( 'Cheatin&#8217; uh?' ) );
@@ -216,4 +210,4 @@ foreach ( $cols as $col => $theme_name ) {
 	}
 }
 
-?>
\ No newline at end of file
+?>
diff --git a/wp-admin/includes/class-wp-users-list-table.php b/wp-admin/includes/class-wp-users-list-table.php
index f2a80dd04..69498e595 100644
--- a/wp-admin/includes/class-wp-users-list-table.php
+++ b/wp-admin/includes/class-wp-users-list-table.php
@@ -8,13 +8,6 @@
  */
 class WP_Users_List_Table extends WP_List_Table {
 
-	function WP_Users_List_Table() {
-		parent::WP_List_Table( array(
-			'screen' => 'users',
-			'plural' => 'users'
-		) );
-	}
-
 	function check_permissions() {
 		if ( !current_user_can('list_users') )
 			wp_die(__('Cheatin&#8217; uh?'));
@@ -275,4 +268,4 @@ class WP_Users_List_Table extends WP_List_Table {
 	}
 }
 
-?>
\ No newline at end of file
+?>
diff --git a/wp-admin/includes/deprecated.php b/wp-admin/includes/deprecated.php
index 38da949b6..b14269b7a 100644
--- a/wp-admin/includes/deprecated.php
+++ b/wp-admin/includes/deprecated.php
@@ -731,7 +731,7 @@ class _WP_List_Table_Compat extends WP_List_Table {
 
 	var $_columns = array();
 
-	function _WP_List_Table_Compat( $screen) {
+	function _WP_List_Table_Compat( $screen ) {
 		parent::WP_List_Table( array(
 			'screen' => $screen,
 			'ajax' => false