diff --git a/includes/t-data/dao_tasks.inc.php b/includes/t-data/dao_tasks.inc.php
index be9cea1..30b0b6e 100644
--- a/includes/t-data/dao_tasks.inc.php
+++ b/includes/t-data/dao_tasks.inc.php
@@ -24,13 +24,26 @@ class DAO_Tasks
 			'SELECT t.task_id AS id, t.item_id AS item, t.task_title AS title, '
 			.		't.task_description AS description, t.task_added AS added_at, '
 			.		'u1.user_email AS added_by, ct.completed_task_time AS completed_at, '
-			.		'u2.user_email AS completed_by , t.task_priority AS priority '
+			.		'u2.user_email AS completed_by , t.task_priority AS priority , '
+			.		'bd.bad_deps AS missing_dependencies '
 			.	'FROM tasks t '
 			.		'INNER JOIN users u1 ON u1.user_id = t.user_id '
 			.		'LEFT OUTER JOIN completed_tasks ct ON ct.task_id = t.task_id '
 			.		'LEFT OUTER JOIN users u2 ON u2.user_id = ct.user_id '
-			.	'ORDER BY ( CASE WHEN ct.task_id IS NULL THEN t.task_priority ELSE -1 END ) DESC , '
-			.		't.task_added DESC' )->execute( );
+			.		'LEFT OUTER JOIN ('
+			.			'SELECT td.task_id , COUNT(*) AS bad_deps '
+			.				'FROM task_dependencies td '
+			.					'LEFT OUTER JOIN completed_tasks dct '
+			.						'ON dct.task_id = td.task_id_depends '
+			.				'WHERE dct.task_id IS NULL '
+			.				'GROUP BY td.task_id'
+			.			') AS bd ON bd.task_id = t.task_id '
+			.	'ORDER BY ( CASE '
+			.			'WHEN ct.task_id IS NULL THEN '
+			.				't.task_priority '
+			.			'ELSE '
+			.				'-1 '
+			.		'END ) DESC , bd.bad_deps ASC NULLS FIRST , t.task_added DESC' )->execute( );
 	}
 
 	public function getAllActiveTasks( )
@@ -39,14 +52,43 @@ class DAO_Tasks
 			'SELECT t.task_id AS id, t.item_id AS item, t.task_title AS title, '
 			.		't.task_description AS description, t.task_added AS added_at, '
 			.		'u1.user_email AS added_by, NULL AS completed_at, NULL AS completed_by , '
-			.		't.task_priority AS priority '
+			.		't.task_priority AS priority , NULL::INT AS missing_dependencies '
 			.	'FROM tasks t '
 			.		'INNER JOIN users u1 ON u1.user_id = t.user_id '
 			.		'LEFT OUTER JOIN completed_tasks ct ON ct.task_id = t.task_id '
-			.	'WHERE ct.task_id IS NULL '
+			.		'LEFT OUTER JOIN ('
+			.			'SELECT td.task_id , td.task_id_depends AS bad_dep '
+			.				'FROM task_dependencies td '
+			.					'LEFT OUTER JOIN completed_tasks dct '
+			.						'ON dct.task_id = td.task_id_depends '
+			.				'WHERE dct.task_id IS NULL'
+			.			') AS bd ON bd.task_id = t.task_id '
+			.	'WHERE ct.task_id IS NULL AND bd.bad_dep IS NULL '
 			.	'ORDER BY t.task_priority DESC , t.task_added DESC' )->execute( );
 	}
 
+	public function getAllBlockedTasks( )
+	{
+		return $this->query(
+			'SELECT t.task_id AS id, t.item_id AS item, t.task_title AS title, '
+			.		't.task_description AS description, t.task_added AS added_at, '
+			.		'u1.user_email AS added_by, NULL AS completed_at, NULL AS completed_by , '
+			.		't.task_priority AS priority , bd.bad_deps AS missing_dependencies '
+			.	'FROM tasks t '
+			.		'INNER JOIN users u1 ON u1.user_id = t.user_id '
+			.		'LEFT OUTER JOIN completed_tasks ct ON ct.task_id = t.task_id '
+			.		'LEFT OUTER JOIN ('
+			.			'SELECT td.task_id , COUNT(*) AS bad_deps '
+			.				'FROM task_dependencies td '
+			.					'LEFT OUTER JOIN completed_tasks dct '
+			.						'ON dct.task_id = td.task_id_depends '
+			.				'WHERE dct.task_id IS NULL '
+			.				'GROUP BY td.task_id'
+			.			') AS bd ON bd.task_id = t.task_id '
+			.	'WHERE ct.task_id IS NULL AND bd.bad_deps <> 0 '
+			.	'ORDER BY t.task_priority DESC , bd.bad_deps DESC , t.task_added DESC' )->execute( );
+	}
+
 
 	public function getTasksAt( Data_Item $item )
 	{
@@ -54,14 +96,27 @@ class DAO_Tasks
 			'SELECT t.task_id AS id, t.task_title AS title, '
 			.		't.task_description AS description, t.task_added AS added_at, '
 			.		'u1.user_email AS added_by, ct.completed_task_time AS completed_at, '
-			.		'u2.user_email AS completed_by , t.task_priority AS priority '
+			.		'u2.user_email AS completed_by , t.task_priority AS priority , '
+			.		'bd.bad_deps AS missing_dependencies '
 			.	'FROM tasks t '
 			.		'INNER JOIN users u1 ON u1.user_id = t.user_id '
 			.		'LEFT OUTER JOIN completed_tasks ct ON ct.task_id = t.task_id '
 			.		'LEFT OUTER JOIN users u2 ON u2.user_id = ct.user_id '
+			.		'LEFT OUTER JOIN ('
+			.			'SELECT td.task_id , COUNT(*) AS bad_deps '
+			.				'FROM task_dependencies td '
+			.					'LEFT OUTER JOIN completed_tasks dct '
+			.						'ON dct.task_id = td.task_id_depends '
+			.				'WHERE dct.task_id IS NULL '
+			.				'GROUP BY td.task_id'
+			.			') AS bd ON bd.task_id = t.task_id '
 			.	'WHERE t.item_id = $1'
-			.	'ORDER BY ( CASE WHEN ct.task_id IS NULL THEN t.task_priority ELSE -1 END ) DESC , '
-			.		't.task_added DESC' )->execute( $item->id );
+			.	'ORDER BY ( CASE '
+			.			'WHEN ct.task_id IS NULL THEN '
+			.				't.task_priority '
+			.			'ELSE '
+			.				'-1 '
+			.		'END ) DESC , bd.bad_deps ASC NULLS FIRST , t.task_added DESC' )->execute( $item->id );
 	}
 
 
diff --git a/includes/t-tasks/page_controllers.inc.php b/includes/t-tasks/page_controllers.inc.php
index 5701e63..645d364 100644
--- a/includes/t-tasks/page_controllers.inc.php
+++ b/includes/t-tasks/page_controllers.inc.php
@@ -15,6 +15,11 @@ class Ctrl_AllTasks
 		if ( $mode == 'active' ) {
 			$tasks = Loader::DAO( 'tasks' )->getAllActiveTasks( );
 			$title = 'Active tasks';
+			$bTitle = 'Display active tasks';
+			$bMode = 'blocked';
+		} elseif ( $mode == 'blocked' ) {
+			$tasks = Loader::DAO( 'tasks' )->getAllBlockedTasks( );
+			$title = 'Blocked tasks';
 			$bTitle = 'Display all tasks';
 			$bMode = 'all';
 		} else {
diff --git a/includes/t-tasks/views.inc.php b/includes/t-tasks/views.inc.php
index a6f3df1..64f8009 100644
--- a/includes/t-tasks/views.inc.php
+++ b/includes/t-tasks/views.inc.php
@@ -80,8 +80,19 @@ class View_AllTasks
 		$addedAtTime = date( 'H:i:s' , $addedAt );
 		array_push( $cell ,
 			HTML::make( 'dd' )->appendText( "Added $addedAtDate at $addedAtTime by {$task->added_by}" ) );
+		if ( $task->missing_dependencies !== null ) {
+			if ( $task->missing_dependencies > 1 ) {
+				$end = 'ies';
+			} else {
+				$end = 'y';
+			}
+			array_push( $cell ,
+				HTML::make( 'dd' )->appendText( "{$task->missing_dependencies} missing dependenc$end" ) );
 
-		if ( $task->completed_by !== null ) {
+			foreach ( $cell as $entry ) {
+				$entry->setAttribute( 'class' , 'missing-deps' );
+			}
+		} elseif ( $task->completed_by !== null ) {
 			$completedAt = strtotime( $task->completed_at );
 			$completedAtDate = date( 'd/m/o' , $completedAt );
 			$completedAtTime = date( 'H:i:s' , $completedAt );
@@ -142,7 +153,19 @@ class View_Tasks
 		array_push( $cell ,
 			HTML::make( 'dd' )->appendText( "Added $addedAtDate at $addedAtTime by {$task->added_by}" ) );
 
-		if ( $task->completed_by !== null ) {
+		if ( $task->missing_dependencies !== null ) {
+			if ( $task->missing_dependencies > 1 ) {
+				$end = 'ies';
+			} else {
+				$end = 'y';
+			}
+			array_push( $cell ,
+				HTML::make( 'dd' )->appendText( "{$task->missing_dependencies} missing dependenc$end" ) );
+
+			foreach ( $cell as $entry ) {
+				$entry->setAttribute( 'class' , 'missing-deps' );
+			}
+		} elseif ( $task->completed_by !== null ) {
 			$completedAt = strtotime( $task->completed_at );
 			$completedAtDate = date( 'd/m/o' , $completedAt );
 			$completedAtTime = date( 'H:i:s' , $completedAt );
diff --git a/site/style.css b/site/style.css
index e5dc4f6..df62cdc 100644
--- a/site/style.css
+++ b/site/style.css
@@ -389,6 +389,10 @@ dl.tasks .completed, dl.tasks .completed * {
 	color: #3f3f3f
 }
 
+dl.tasks .missing-deps, dl.tasks .missing-deps * {
+	color: #7f3f3f
+}
+
 dl.tasks dt.sub-title.completed {
 	color: #bfbfbf;
 	text-shadow: 1px 1px 2px #3f3f3f;