diff --git a/views/ngXosLib/bower.json b/views/ngXosLib/bower.json
index bc9c23a..228a082 100644
--- a/views/ngXosLib/bower.json
+++ b/views/ngXosLib/bower.json
@@ -21,7 +21,8 @@
     "angular-cookies": "1.4.7",
     "angular-animate": "1.4.7",
     "lodash": "~4.11.1",
-    "angular-chart.js": "~0.10.2"
+    "angular-chart.js": "~0.10.2",
+    "d3": "~3.5.17"
   },
   "devDependencies": {
     "angular-mocks": "1.4.7",
diff --git a/views/ngXosLib/xosHelpers/src/services/rest/Services.js b/views/ngXosLib/xosHelpers/src/services/rest/Services.js
index a39098a..eda57e4 100644
--- a/views/ngXosLib/xosHelpers/src/services/rest/Services.js
+++ b/views/ngXosLib/xosHelpers/src/services/rest/Services.js
@@ -4,7 +4,7 @@
   angular.module('xos.helpers')
   /**
   * @ngdoc service
-  * @name xos.helpers.Instances
+  * @name xos.helpers.Services
   * @description Angular resource to fetch /api/core/services/:id/
   **/
   .service('Services', function($resource){
diff --git a/views/ngXosLib/xosHelpers/src/services/rest/Tenant.js b/views/ngXosLib/xosHelpers/src/services/rest/Tenant.js
new file mode 100644
index 0000000..8feb102
--- /dev/null
+++ b/views/ngXosLib/xosHelpers/src/services/rest/Tenant.js
@@ -0,0 +1,15 @@
+(function() {
+  'use strict';
+
+  angular.module('xos.helpers')
+  /**
+  * @ngdoc service
+  * @name xos.helpers.Tenant
+  * @description Angular resource to fetch /api/core/tenant/:id/
+  **/
+  .service('Tenants', function($resource){
+    return $resource('/api/core/tenants/:id/', { id: '@id' }, {
+      update: { method: 'PUT' }
+    });
+  })
+})();
\ No newline at end of file
diff --git a/views/ngXosLib/xosHelpers/src/services/service_graph.service.js b/views/ngXosLib/xosHelpers/src/services/service_graph.service.js
new file mode 100644
index 0000000..8a732a2
--- /dev/null
+++ b/views/ngXosLib/xosHelpers/src/services/service_graph.service.js
@@ -0,0 +1,44 @@
+(function() {
+  'use strict';
+
+  /**
+  * @ngdoc service
+  * @name xos.helpers.ServiceGraph
+  * @description This factory define a set of helper function to query the service tenancy graph
+  **/
+
+  angular
+  .module('xos.helpers')
+  .service('GraphService', function($q, Tenants, Services) {
+
+    this.loadCoarseData = () => {
+
+      let services;
+
+      let deferred = $q.defer();
+
+      Services.query().$promise
+      .then((res) => {
+        services = res;
+        return Tenants.query({kind: 'coarse'}).$promise;
+      })
+      .then((tenants) => {
+        deferred.resolve({
+          tenants: tenants,
+          services: services
+        });
+      })
+
+      return deferred.promise;
+    }
+
+    this.getCoarseGraph = () => {
+      this.loadCoarseData()
+      .then((res) => {
+        console.log(res);
+      })
+      return 'ciao';
+    };
+
+  })
+})();