diff --git a/doc/source/template_validation_status_code.rst b/doc/source/template_validation_status_code.rst
index 0d405430f..e76ae89c8 100644
--- a/doc/source/template_validation_status_code.rst
+++ b/doc/source/template_validation_status_code.rst
@@ -101,3 +101,6 @@ The following describes all the possible status code and their messages:
 | 132              | add_causal_relationship action requires action_target to| content                       |
 |                  | be ALARM                                                |                               |
 +------------------+---------------------------------------------------------+-------------------------------+
+| 133              | execute_mistral action must contain workflow field in   | content                       |
+|                  | properties block                                        |                               |
++------------------+---------------------------------------------------------+-------------------------------+
diff --git a/vitrage/evaluator/actions/action_executor.py b/vitrage/evaluator/actions/action_executor.py
index 805bab475..685f0c0cd 100644
--- a/vitrage/evaluator/actions/action_executor.py
+++ b/vitrage/evaluator/actions/action_executor.py
@@ -25,12 +25,14 @@ from vitrage.evaluator.actions.evaluator_event_transformer \
     import VITRAGE_DATASOURCE
 from vitrage.evaluator.actions.recipes.action_steps import ADD_EDGE
 from vitrage.evaluator.actions.recipes.action_steps import ADD_VERTEX
+from vitrage.evaluator.actions.recipes.action_steps import EXECUTE_EXTERNAL
 from vitrage.evaluator.actions.recipes.action_steps import REMOVE_EDGE
 from vitrage.evaluator.actions.recipes.action_steps import REMOVE_VERTEX
 from vitrage.evaluator.actions.recipes.action_steps import UPDATE_VERTEX
 from vitrage.evaluator.actions.recipes.add_causal_relationship import \
     AddCausalRelationship
 from vitrage.evaluator.actions.recipes.base import EVALUATOR_EVENT_TYPE
+from vitrage.evaluator.actions.recipes.execute_mistral import ExecuteMistral
 from vitrage.evaluator.actions.recipes.mark_down import MarkDown
 from vitrage.evaluator.actions.recipes.raise_alarm import RaiseAlarm
 from vitrage.evaluator.actions.recipes.set_state import SetState
@@ -44,11 +46,12 @@ class ActionExecutor(object):
         self.action_recipes = ActionExecutor._register_action_recipes()
 
         self.action_step_defs = {
-            ADD_VERTEX: self.add_vertex,
-            REMOVE_VERTEX: self.remove_vertex,
-            UPDATE_VERTEX: self.update_vertex,
-            ADD_EDGE: self.add_edge,
-            REMOVE_EDGE: self.remove_edge,
+            ADD_VERTEX: self._add_vertex,
+            REMOVE_VERTEX: self._remove_vertex,
+            UPDATE_VERTEX: self._update_vertex,
+            ADD_EDGE: self._add_edge,
+            REMOVE_EDGE: self._remove_edge,
+            EXECUTE_EXTERNAL: self._execute_external,
         }
 
     def execute(self, action_spec, action_mode):
@@ -62,7 +65,7 @@ class ActionExecutor(object):
         for step in steps:
             self.action_step_defs[step.type](step.params)
 
-    def add_vertex(self, params):
+    def _add_vertex(self, params):
 
         event = copy.deepcopy(params)
         ActionExecutor._add_default_properties(event)
@@ -70,7 +73,7 @@ class ActionExecutor(object):
 
         self.event_queue.put(event)
 
-    def update_vertex(self, params):
+    def _update_vertex(self, params):
 
         event = copy.deepcopy(params)
         ActionExecutor._add_default_properties(event)
@@ -78,14 +81,14 @@ class ActionExecutor(object):
 
         self.event_queue.put(event)
 
-    def remove_vertex(self, params):
+    def _remove_vertex(self, params):
         event = copy.deepcopy(params)
         ActionExecutor._add_default_properties(event)
         event[EVALUATOR_EVENT_TYPE] = REMOVE_VERTEX
 
         self.event_queue.put(event)
 
-    def add_edge(self, params):
+    def _add_edge(self, params):
 
         event = copy.deepcopy(params)
         ActionExecutor._add_default_properties(event)
@@ -93,7 +96,7 @@ class ActionExecutor(object):
 
         self.event_queue.put(event)
 
-    def remove_edge(self, params):
+    def _remove_edge(self, params):
 
         event = copy.deepcopy(params)
         ActionExecutor._add_default_properties(event)
@@ -101,6 +104,12 @@ class ActionExecutor(object):
 
         self.event_queue.put(event)
 
+    def _execute_external(self, params):
+
+        # TODO(ifat_afek): send to a dedicated queue
+        # external_engine = params[EXECUTION_ENGINE]
+        pass
+
     @staticmethod
     def _add_default_properties(event):
 
@@ -129,4 +138,7 @@ class ActionExecutor(object):
         recipes[ActionType.MARK_DOWN] = importutils.import_object(
             "%s.%s" % (MarkDown.__module__, MarkDown.__name__))
 
+        recipes[ActionType.EXECUTE_MISTRAL] = importutils.import_object(
+            "%s.%s" % (ExecuteMistral.__module__, ExecuteMistral.__name__))
+
         return recipes
diff --git a/vitrage/evaluator/actions/base.py b/vitrage/evaluator/actions/base.py
index 6f93d9b73..e010f42a4 100644
--- a/vitrage/evaluator/actions/base.py
+++ b/vitrage/evaluator/actions/base.py
@@ -19,11 +19,13 @@ class ActionType(object):
     RAISE_ALARM = 'raise_alarm'
     ADD_CAUSAL_RELATIONSHIP = 'add_causal_relationship'
     MARK_DOWN = 'mark_down'
+    EXECUTE_MISTRAL = 'execute_mistral'
 
 action_types = [ActionType.SET_STATE,
                 ActionType.RAISE_ALARM,
                 ActionType.ADD_CAUSAL_RELATIONSHIP,
-                ActionType.MARK_DOWN]
+                ActionType.MARK_DOWN,
+                ActionType.EXECUTE_MISTRAL]
 
 
 class ActionMode(object):
diff --git a/vitrage/evaluator/actions/recipes/action_steps.py b/vitrage/evaluator/actions/recipes/action_steps.py
index d69075267..4bdfdc181 100644
--- a/vitrage/evaluator/actions/recipes/action_steps.py
+++ b/vitrage/evaluator/actions/recipes/action_steps.py
@@ -17,3 +17,6 @@ REMOVE_VERTEX = 'remove_vertex'
 UPDATE_VERTEX = 'update_vertex'
 ADD_EDGE = 'add_edge'
 REMOVE_EDGE = 'remove_edge'
+EXECUTE_EXTERNAL = 'execute_external'
+
+EXECUTION_ENGINE = 'execution_engine'
diff --git a/vitrage/evaluator/actions/recipes/execute_mistral.py b/vitrage/evaluator/actions/recipes/execute_mistral.py
new file mode 100644
index 000000000..315d2c023
--- /dev/null
+++ b/vitrage/evaluator/actions/recipes/execute_mistral.py
@@ -0,0 +1,59 @@
+# Copyright 2017 - Nokia
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+from vitrage.evaluator.actions.recipes.action_steps import EXECUTE_EXTERNAL
+from vitrage.evaluator.actions.recipes.action_steps import EXECUTION_ENGINE
+from vitrage.evaluator.actions.recipes import base
+from vitrage.evaluator.actions.recipes.base import ActionStepWrapper
+
+
+MISTRAL = 'mistral'
+WORKFLOW = 'workflow'
+
+
+class ExecuteMistral(base.Recipe):
+    """Execute a Mistral workflow
+
+    The 'get_do_recipe' and 'get_undo_recipe' receive action_spec as input.
+    The action_spec contains the following fields: type and properties.
+
+    example input:
+
+    action_spec = ActionSpecs('type'= {'execute_mistral'},
+                              'properties' = {workflow : wf_1,
+                                              host: host_2,
+                                              host_status: down}
+    """
+
+    @staticmethod
+    def get_do_recipe(action_spec):
+
+        execute_external_step = ExecuteMistral._get_execute_external_step(
+            action_spec.properties
+        )
+
+        return [execute_external_step]
+
+    @staticmethod
+    def get_undo_recipe(action_spec):
+        # No undo for execute an external action
+        return []
+
+    @staticmethod
+    def _get_execute_external_step(properties):
+
+        properties[EXECUTION_ENGINE] = MISTRAL
+        execute_external_step = ActionStepWrapper(EXECUTE_EXTERNAL,
+                                                  properties)
+
+        return execute_external_step
diff --git a/vitrage/evaluator/scenario_evaluator.py b/vitrage/evaluator/scenario_evaluator.py
index 62f495ef6..d0da932c4 100644
--- a/vitrage/evaluator/scenario_evaluator.py
+++ b/vitrage/evaluator/scenario_evaluator.py
@@ -382,7 +382,8 @@ class ActionTracker(object):
             ActionType.SET_STATE: pt.SetStateTools(all_scores),
             ActionType.RAISE_ALARM: pt.RaiseAlarmTools(alarms_score),
             ActionType.ADD_CAUSAL_RELATIONSHIP: pt.BaselineTools,
-            ActionType.MARK_DOWN: pt.BaselineTools
+            ActionType.MARK_DOWN: pt.BaselineTools,
+            ActionType.EXECUTE_MISTRAL: pt.BaselineTools
         }
 
     def get_key(self, action_specs):
diff --git a/vitrage/evaluator/template_data.py b/vitrage/evaluator/template_data.py
index 13bd2b784..cf7740c4b 100644
--- a/vitrage/evaluator/template_data.py
+++ b/vitrage/evaluator/template_data.py
@@ -274,7 +274,7 @@ class TemplateData(object):
 
                 action_dict = action_def[TFields.ACTION]
                 action_type = action_dict[TFields.ACTION_TYPE]
-                targets = action_dict[TFields.ACTION_TARGET]
+                targets = action_dict.get(TFields.ACTION_TARGET, {})
                 properties = action_dict.get(TFields.PROPERTIES, {})
 
                 actions.append(ActionSpecs(action_type, targets, properties))
diff --git a/vitrage/evaluator/template_validation/content/execute_mistral_validator.py b/vitrage/evaluator/template_validation/content/execute_mistral_validator.py
new file mode 100644
index 000000000..1a18c3353
--- /dev/null
+++ b/vitrage/evaluator/template_validation/content/execute_mistral_validator.py
@@ -0,0 +1,41 @@
+# Copyright 2017 - Nokia
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+from oslo_log import log
+
+from vitrage.evaluator.actions.recipes.execute_mistral import WORKFLOW
+from vitrage.evaluator.template_fields import TemplateFields
+from vitrage.evaluator.template_validation.content.base import \
+    ActionValidator
+from vitrage.evaluator.template_validation.content.base import \
+    get_content_correct_result
+from vitrage.evaluator.template_validation.content.base import \
+    get_content_fault_result
+from vitrage.evaluator.template_validation.status_messages import status_msgs
+
+
+LOG = log.getLogger(__name__)
+
+
+class ExecuteMistralValidator(ActionValidator):
+
+    @staticmethod
+    def validate(action, definitions_index):
+        properties = action[TemplateFields.PROPERTIES]
+
+        if WORKFLOW not in properties or not properties[WORKFLOW]:
+            LOG.error('%s status code: %s' % (status_msgs[133], 133))
+            return get_content_fault_result(133)
+
+        return get_content_correct_result()
diff --git a/vitrage/evaluator/template_validation/status_messages.py b/vitrage/evaluator/template_validation/status_messages.py
index 58efa8ed7..dfddab409 100644
--- a/vitrage/evaluator/template_validation/status_messages.py
+++ b/vitrage/evaluator/template_validation/status_messages.py
@@ -62,8 +62,8 @@ status_msgs = {
          '{actions}'.format(actions=action_types),
     121: 'At least one action must be defined.',
     122: 'Action field is required.',
-    123: 'Relationship definition must contain action_type field.',
-    124: 'Relationship definition must contain action_target field.',
+    123: 'Action definition must contain action_type field.',
+    124: 'Action definition must contain action_target field.',
     125: 'raise_alarm action must contain alarm_name field in properties '
          'block.',
     126: 'raise_alarm action must contain severity field in properties block.',
@@ -74,6 +74,8 @@ status_msgs = {
          'in target_action block.',
     131: 'mark_down action must contain \'target\' field in'
          ' \'target_action\' block.',
-    132: 'add_causal_relationship action requires action_target to be ALARM'
+    132: 'add_causal_relationship action requires action_target to be ALARM',
+    133: 'execute_mistral action must contain workflow field in properties '
+         'block'
 
 }
diff --git a/vitrage/tests/base.py b/vitrage/tests/base.py
index b4ef99b1c..5864d259f 100644
--- a/vitrage/tests/base.py
+++ b/vitrage/tests/base.py
@@ -17,6 +17,10 @@ from oslo_utils import timeutils
 # noinspection PyPackageRequirements
 from oslotest import base
 import sys
+from testtools.matchers import HasLength
+
+
+IsEmpty = lambda: HasLength(0)
 
 
 class BaseTest(base.BaseTestCase):
diff --git a/vitrage/tests/unit/evaluator/recipes/test_execute_mistral.py b/vitrage/tests/unit/evaluator/recipes/test_execute_mistral.py
new file mode 100644
index 000000000..779f2532e
--- /dev/null
+++ b/vitrage/tests/unit/evaluator/recipes/test_execute_mistral.py
@@ -0,0 +1,70 @@
+# Copyright 2017 - Nokia
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+from testtools.matchers import HasLength
+from vitrage.evaluator.actions.base import ActionType
+from vitrage.evaluator.actions.recipes.action_steps import EXECUTE_EXTERNAL
+from vitrage.evaluator.actions.recipes.action_steps import EXECUTION_ENGINE
+from vitrage.evaluator.actions.recipes.execute_mistral import ExecuteMistral
+from vitrage.evaluator.actions.recipes.execute_mistral import MISTRAL
+from vitrage.evaluator.actions.recipes.execute_mistral import WORKFLOW
+from vitrage.evaluator.template_data import ActionSpecs
+from vitrage.tests.base import BaseTest
+from vitrage.tests.base import IsEmpty
+
+
+class RaiseAlarmRecipeTest(BaseTest):
+
+    # noinspection PyPep8Naming
+    @classmethod
+    def setUpClass(cls):
+
+        cls.props = {EXECUTION_ENGINE: MISTRAL,
+                     WORKFLOW: 'wf_4',
+                     'host': 'host5',
+                     'state': 'ok'}
+        cls.action_spec = ActionSpecs(ActionType.EXECUTE_MISTRAL,
+                                      {},
+                                      cls.props)
+
+    def test_get_do_recipe(self):
+
+        # Test Action
+        action_steps = ExecuteMistral.get_do_recipe(self.action_spec)
+
+        # Test Assertions
+
+        # expecting for one step: [execute_external]
+        self.assertThat(action_steps, HasLength(1))
+
+        self.assertEqual(EXECUTE_EXTERNAL, action_steps[0].type)
+        execute_external_step_params = action_steps[0].params
+        self.assertIsNotNone(execute_external_step_params)
+        self.assertLessEqual(2, len(execute_external_step_params))
+
+        execution_engine = execute_external_step_params[EXECUTION_ENGINE]
+        self.assertEqual(self.props[EXECUTION_ENGINE], execution_engine)
+
+        workflow = execute_external_step_params[WORKFLOW]
+        self.assertEqual(self.props[WORKFLOW], workflow)
+
+    def test_get_undo_recipe(self):
+
+        # Test Action
+        action_steps = ExecuteMistral.get_undo_recipe(self.action_spec)
+
+        # Test Assertions
+
+        # expecting for zero steps (no undo for this action)
+        self.assertThat(action_steps, IsEmpty())
diff --git a/vitrage/tests/unit/evaluator/template_validation/content/test_execute_mistral_validator.py b/vitrage/tests/unit/evaluator/template_validation/content/test_execute_mistral_validator.py
new file mode 100644
index 000000000..640acdaa2
--- /dev/null
+++ b/vitrage/tests/unit/evaluator/template_validation/content/test_execute_mistral_validator.py
@@ -0,0 +1,99 @@
+# Copyright 2017 - Nokia
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+from vitrage.evaluator.actions.base import ActionType
+from vitrage.evaluator.actions.recipes.execute_mistral import WORKFLOW
+from vitrage.evaluator.template_fields import TemplateFields
+from vitrage.evaluator.template_validation.content.execute_mistral_validator \
+    import ExecuteMistralValidator
+from vitrage.tests.unit.evaluator.template_validation.content.base import \
+    ActionValidatorTest
+from vitrage.tests.unit.evaluator.template_validation.content.base import \
+    DEFINITIONS_INDEX_MOCK
+
+
+class ExecuteMistralValidatorTest(ActionValidatorTest):
+
+    def test_validate_execute_mistral_action(self):
+
+        self._validate_action(
+            self._create_execute_mistral_action('wf_1', 'host_2', 'down'),
+            ExecuteMistralValidator.validate
+        )
+
+    def test_validate_execute_mistral_action_without_workflow(self):
+
+        # Test setup
+        idx = DEFINITIONS_INDEX_MOCK.copy()
+        action = self._create_execute_mistral_action('wf_1', 'host_2', 'down')
+        action[TemplateFields.PROPERTIES].pop(WORKFLOW)
+
+        # Test action
+        result = ExecuteMistralValidator.validate(action, idx)
+
+        # Test assertions
+        self._assert_fault_result(result, 133)
+
+    def test_validate_execute_mistral_action_with_empty_workflow(self):
+
+        # Test setup
+        idx = DEFINITIONS_INDEX_MOCK.copy()
+        action = self._create_execute_mistral_action('', 'host_2', 'down')
+
+        # Test action
+        result = ExecuteMistralValidator.validate(action, idx)
+
+        # Test assertions
+        self._assert_fault_result(result, 133)
+
+    def test_validate_execute_mistral_action_with_none_workflow(self):
+
+        # Test setup
+        idx = DEFINITIONS_INDEX_MOCK.copy()
+        action = self._create_execute_mistral_action(None, 'host_2', 'down')
+
+        # Test action
+        result = ExecuteMistralValidator.validate(action, idx)
+
+        # Test assertions
+        self._assert_fault_result(result, 133)
+
+    def test_validate_execute_mistral_action_without_additional_params(self):
+
+        # Test setup - having only the 'workflow' param is a legal config
+        idx = DEFINITIONS_INDEX_MOCK.copy()
+        action = self._create_execute_mistral_action('wf_1', 'host_2', 'down')
+        action[TemplateFields.PROPERTIES].pop('host')
+        action[TemplateFields.PROPERTIES].pop('host_state')
+
+        # Test action
+        result = ExecuteMistralValidator.validate(action, idx)
+
+        # Test assertions
+        self._assert_correct_result(result)
+
+    @staticmethod
+    def _create_execute_mistral_action(workflow, host, host_state):
+
+        properties = {
+            WORKFLOW: workflow,
+            'host': host,
+            'host_state': host_state
+        }
+        action = {
+            TemplateFields.ACTION_TYPE: ActionType.EXECUTE_MISTRAL,
+            TemplateFields.PROPERTIES: properties
+        }
+
+        return action