diff --git a/lib/api/v3/work_packages/relation_model.rb b/lib/api/v3/work_packages/relation_model.rb
new file mode 100644
index 0000000000..117e013da4
--- /dev/null
+++ b/lib/api/v3/work_packages/relation_model.rb
@@ -0,0 +1,57 @@
+#-- encoding: UTF-8
+#-- copyright
+# OpenProject is a project management system.
+# Copyright (C) 2012-2014 the OpenProject Foundation (OPF)
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program 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.
+#
+# This program 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 Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See doc/COPYRIGHT.rdoc for more details.
+#++
+
+require 'reform'
+require 'reform/form/coercion'
+
+module API
+  module V3
+    module WorkPackages
+      class RelationModel < Reform::Form
+        include Coercion
+
+        # NOTE: to avoid a naming collision with DelayedJob, we define an
+        # explicit method here rather than relying on the #property macro.
+        #
+        # @see Relation#delay
+        def delay
+          model.delay
+        end
+
+        def delay=(value)
+          model.delay = value
+        end
+
+        # def type
+        #   model.relation_type
+        # end
+      end
+    end
+  end
+end
diff --git a/lib/api/v3/work_packages/relation_representer.rb b/lib/api/v3/work_packages/relation_representer.rb
new file mode 100644
index 0000000000..3de714ae50
--- /dev/null
+++ b/lib/api/v3/work_packages/relation_representer.rb
@@ -0,0 +1,88 @@
+#-- encoding: UTF-8
+#-- copyright
+# OpenProject is a project management system.
+# Copyright (C) 2012-2014 the OpenProject Foundation (OPF)
+#
+# This program is free software; you can redistribute it and/or
+# modify it under the terms of the GNU General Public License version 3.
+#
+# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
+# Copyright (C) 2006-2013 Jean-Philippe Lang
+# Copyright (C) 2010-2013 the ChiliProject Team
+#
+# This program 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.
+#
+# This program 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 Street, Fifth Floor, Boston, MA  02110-1301, USA.
+#
+# See doc/COPYRIGHT.rdoc for more details.
+#++
+
+require 'roar/decorator'
+require 'roar/representer/json/hal'
+
+module API
+  module V3
+    module WorkPackages
+      class RelationRepresenter < Roar::Decorator
+        include Roar::Representer::JSON::HAL
+        include Roar::Representer::Feature::Hypermedia
+        include ::Rails.application.routes.url_helpers
+
+        self.as_strategy = API::Utilities::CamelCasingStrategy.new
+
+        def initialize(model, options = {}, *expand)
+          @current_user = options[:current_user]
+          @work_package = options[:work_package]
+          @expand = expand
+
+          super(model)
+        end
+
+        property :_type, exec_context: :decorator
+
+        link :self do
+         { href: "#{root_url}/api/v3/relationships/#{represented.model.id}" }
+        end
+
+        link :relatedWorkPackage do
+          { href: "#{root_url}/api/v3/work_packages/#{related_work_package.id}" }
+        end
+
+        property :delay, getter: -> (*) { model.delay }, render_nil: true, if: -> (*) { model.relation_type == 'precedes' }
+
+        def _type
+          "Relation::#{relation_type}"
+        end
+
+        private
+
+          def default_url_options
+            ActionController::Base.default_url_options
+          end
+
+          def related_work_package
+            if  represented.model.from == @work_package
+              represented.model.to
+            else
+              represented.model.from
+            end
+          end
+
+          def relation_type
+            represented.model.relation_type_for(@work_package).camelize
+          end
+
+      end
+    end
+  end
+end