diff --git a/src/changelog.model.js b/src/changelog.model.js
index 0b961f0..3ce8178 100644
--- a/src/changelog.model.js
+++ b/src/changelog.model.js
@@ -29,6 +29,8 @@ const SCHEMA = mergeObjects(
   { image, audio, video, document }
 );
 
+// TODO: all criteria use $in operator
+
 /**
  * @module ChangeLog
  * @namespace ChangeLog
diff --git a/src/event.model.js b/src/event.model.js
index 6de54ce..55ef179 100644
--- a/src/event.model.js
+++ b/src/event.model.js
@@ -25,6 +25,10 @@ import {
   PREDEFINE_OPTION_AUTOPOPULATE,
 } from './internals';
 
+// TODO: send notification after create
+// TODO: calculate expose(risk) after create
+// TODO: send actions after create
+
 /**
  * @module Event
  * @namespace Event
diff --git a/src/schema/base.schema.js b/src/schema/base.schema.js
index 4f05994..08e65a5 100644
--- a/src/schema/base.schema.js
+++ b/src/schema/base.schema.js
@@ -93,3 +93,95 @@ export const type = {
   aggregatable: { unwind: true },
   default: undefined,
 };
+
+/**
+ * @name function
+ * @alias fanction
+ * @description Group event response activities(i.e actions)
+ *
+ * @memberof Event
+ * @memberof ChangeLog
+ *
+ * @type {object}
+ * @property {object} type - schema(data) type
+ * @property {boolean} required - mark required
+ * @property {boolean} index - ensure database index
+ * @property {boolean} exists - ensure ref exists before save
+ * @property {object} autopopulate - auto populate(eager loading) options
+ * @property {boolean} taggable - allow field use for tagging
+ * @property {boolean} exportable - allow field use for exporting
+ * @property {boolean} aggregatable - allow field use for aggregation
+ * @property {boolean} default - default value set when none provided
+ * @property {object} fake - fake data generator options
+ *
+ * @author lally elias <lallyelias87@gmail.com>
+ * @since 0.1.0
+ * @version 0.1.0
+ * @instance
+ * @example
+ * {
+ *   _id: '5dde6ca33631a92c2d616298',
+ *   strings: { name: { en: 'Communication and Warning' } },
+ * }
+ */
+export const fanction = {
+  type: ObjectId,
+  ref: Predefine.MODEL_NAME,
+  // required: true,
+  index: true,
+  exists: true,
+  autopopulate: PREDEFINE_OPTION_AUTOPOPULATE,
+  taggable: true,
+  exportable: {
+    format: v => get(v, 'strings.name.en'),
+    default: 'NA',
+  },
+  aggregatable: { unwind: true },
+  default: undefined,
+};
+
+/**
+ * @name action
+ * @alias action
+ * @description Define an event response activity.
+ *
+ * @memberof Event
+ * @memberof ChangeLog
+ *
+ * @type {object}
+ * @property {object} type - schema(data) type
+ * @property {boolean} required - mark required
+ * @property {boolean} index - ensure database index
+ * @property {boolean} exists - ensure ref exists before save
+ * @property {object} autopopulate - auto populate(eager loading) options
+ * @property {boolean} taggable - allow field use for tagging
+ * @property {boolean} exportable - allow field use for exporting
+ * @property {boolean} aggregatable - allow field use for aggregation
+ * @property {boolean} default - default value set when none provided
+ * @property {object} fake - fake data generator options
+ *
+ * @author lally elias <lallyelias87@gmail.com>
+ * @since 0.1.0
+ * @version 0.1.0
+ * @instance
+ * @example
+ * {
+ *   _id: '5dde6ca33631a92c2d616298',
+ *   strings: { name: { en: 'Disseminating warning information' } },
+ * }
+ */
+export const action = {
+  type: ObjectId,
+  ref: Predefine.MODEL_NAME,
+  // required: true,
+  index: true,
+  exists: true,
+  autopopulate: PREDEFINE_OPTION_AUTOPOPULATE,
+  taggable: true,
+  exportable: {
+    format: v => get(v, 'strings.name.en'),
+    default: 'NA',
+  },
+  aggregatable: { unwind: true },
+  default: undefined,
+};