diff --git a/src/IDF/IssueRelation.php b/src/IDF/IssueRelation.php
new file mode 100644
index 0000000..f918631
--- /dev/null
+++ b/src/IDF/IssueRelation.php
@@ -0,0 +1,93 @@
+<?php
+/* -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+# ***** BEGIN LICENSE BLOCK *****
+# This file is part of InDefero, an open source project management application.
+# Copyright (C) 2008-2011 Céondo Ltd and contributors.
+#
+# InDefero is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# InDefero is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+# ***** END LICENSE BLOCK ***** */
+
+/**
+ * A relation of one issue to another
+ */
+class IDF_IssueRelation extends Pluf_Model
+{
+    public $_model = __CLASS__;
+
+    function init()
+    {
+        $this->_a['table'] = 'idf_issuerelations';
+        $this->_a['model'] = __CLASS__;
+        $this->_a['cols'] = array(
+                             // It is mandatory to have an "id" column.
+                            'id' =>
+                            array(
+                                  'type' => 'Pluf_DB_Field_Sequence',
+                                  'blank' => true,
+                                  ),
+                            'issue' =>
+                            array(
+                                  'type' => 'Pluf_DB_Field_Foreignkey',
+                                  'model' => 'IDF_Issue',
+                                  'blank' => false,
+                                  'verbose' => __('issue'),
+                                  'relate_name' => 'issues',
+                                  ),
+                            'verb' =>
+                            array(
+                                  'type' => 'Pluf_DB_Field_Text',
+                                  'blank' => false,
+                                  'verbose' => __('verb'),
+                                  ),
+                            'other_issue' =>
+                            array(
+                                  'type' => 'Pluf_DB_Field_Foreignkey',
+                                  'model' => 'IDF_Issue',
+                                  'blank' => false,
+                                  'verbose' => __('other issue'),
+                                  'relate_name' => 'other_issues',
+                                  ),
+                            'submitter' =>
+                            array(
+                                  'type' => 'Pluf_DB_Field_Foreignkey',
+                                  'model' => 'Pluf_User',
+                                  'blank' => false,
+                                  'verbose' => __('submitter'),
+                                   ),
+                            'creation_dtime' =>
+                            array(
+                                  'type' => 'Pluf_DB_Field_Datetime',
+                                  'blank' => true,
+                                  'verbose' => __('creation date'),
+                                  ),
+                            );
+        $this->_a['idx'] = array(
+                            'creation_dtime_idx' =>
+                            array(
+                                  'col' => 'creation_dtime',
+                                  'type' => 'normal',
+                                  ),
+                            );
+    }
+
+    function preSave($create=false)
+    {
+        if ($this->id == '') {
+            $this->creation_dtime = gmdate('Y-m-d H:i:s');
+        }
+    }
+}
diff --git a/src/IDF/Migrations/17AddIssueRelations.php b/src/IDF/Migrations/17AddIssueRelations.php
new file mode 100644
index 0000000..0bf7700
--- /dev/null
+++ b/src/IDF/Migrations/17AddIssueRelations.php
@@ -0,0 +1,44 @@
+<?php
+/* -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+# ***** BEGIN LICENSE BLOCK *****
+# This file is part of InDefero, an open source project management application.
+# Copyright (C) 2008-2011 Céondo Ltd and contributors.
+#
+# InDefero is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# InDefero is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+#
+# ***** END LICENSE BLOCK ***** */
+
+/**
+ * Add the new IDF_IssueRelation model.
+ *
+ */
+
+function IDF_Migrations_17AddIssueRelations_up($params=null)
+{
+    $db = Pluf::db();
+    $schema = new Pluf_DB_Schema($db);
+    $schema->model = new IDF_IssueRelation();
+    $schema->createTables();
+}
+
+function IDF_Migrations_17AddIssueRelations_down($params=null)
+{
+    $db = Pluf::db();
+    $schema = new Pluf_DB_Schema($db);
+    $schema->model = new IDF_IssueRelation();
+    $schema->dropTables();
+}
+
diff --git a/src/IDF/Migrations/Backup.php b/src/IDF/Migrations/Backup.php
index 406b086..32fcb9e 100644
--- a/src/IDF/Migrations/Backup.php
+++ b/src/IDF/Migrations/Backup.php
@@ -54,6 +54,7 @@ function IDF_Migrations_Backup_run($folder, $name=null)
                     'IDF_Queue',
                     'IDF_Gconf',
                     'IDF_EmailAddress',
+                    'IDF_IssueRelation',
                     );
     $db = Pluf::db();
     // Now, for each table, we dump the content in json, this is a
@@ -100,6 +101,7 @@ function IDF_Migrations_Backup_restore($folder, $name)
                     'IDF_Queue',
                     'IDF_Gconf',
                     'IDF_EmailAddress',
+                    'IDF_IssueRelation',
                     );
     $db = Pluf::db();
     $schema = new Pluf_DB_Schema($db);
diff --git a/src/IDF/Migrations/Install.php b/src/IDF/Migrations/Install.php
index 98c62fc..aea5f00 100644
--- a/src/IDF/Migrations/Install.php
+++ b/src/IDF/Migrations/Install.php
@@ -51,6 +51,7 @@ function IDF_Migrations_Install_setup($params=null)
                     'IDF_Queue',
                     'IDF_Gconf',
                     'IDF_EmailAddress',
+                    'IDF_IssueRelation',
                     );
     $db = Pluf::db();
     $schema = new Pluf_DB_Schema($db);
@@ -109,6 +110,7 @@ function IDF_Migrations_Install_teardown($params=null)
                     'IDF_Commit',
                     'IDF_Project',
                     'IDF_EmailAddress',
+                    'IDF_IssueRelation',
                     );
     $db = Pluf::db();
     $schema = new Pluf_DB_Schema($db);
diff --git a/src/IDF/relations.php b/src/IDF/relations.php
index dc951e7..38f0ea1 100644
--- a/src/IDF/relations.php
+++ b/src/IDF/relations.php
@@ -45,6 +45,7 @@ $m['IDF_Scm_Cache_Git'] = array('relate_to' => array('IDF_Project'));
 
 $m['IDF_UserData'] = array('relate_to' => array('Pluf_User'));
 $m['IDF_EmailAddress'] = array('relate_to' => array('Pluf_User'));
+$m['IDF_IssueRelation'] = array('relate_to' => array('IDF_Issue', 'Pluf_User'));
 
 Pluf_Signal::connect('Pluf_Template_Compiler::construct_template_tags_modifiers',
                      array('IDF_Middleware', 'updateTemplateTagsModifiers'));