diff --git a/src/main/java/ch/ethz/seb/sebserver/gbl/model/Activatable.java b/src/main/java/ch/ethz/seb/sebserver/gbl/model/Activatable.java
new file mode 100644
index 00000000..2eb27d91
--- /dev/null
+++ b/src/main/java/ch/ethz/seb/sebserver/gbl/model/Activatable.java
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2018 ETH Zürich, Educational Development and Technology (LET)
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+package ch.ethz.seb.sebserver.gbl.model;
+
+public interface Activatable {
+
+    boolean isActive();
+
+}
diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/activation/EntityActivationEvent.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/activation/EntityActivationEvent.java
new file mode 100644
index 00000000..3cd03ac3
--- /dev/null
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/activation/EntityActivationEvent.java
@@ -0,0 +1,28 @@
+/*
+ * Copyright (c) 2018 ETH Zürich, Educational Development and Technology (LET)
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+package ch.ethz.seb.sebserver.webservice.servicelayer.activation;
+
+import org.springframework.context.ApplicationEvent;
+
+import ch.ethz.seb.sebserver.gbl.model.Entity;
+
+public final class EntityActivationEvent extends ApplicationEvent {
+
+    private static final long serialVersionUID = -6712364320755441148L;
+
+    public final boolean activated;
+    public final Entity entity;
+
+    public EntityActivationEvent(final Entity source, final boolean activated) {
+        super(source);
+        this.entity = source;
+        this.activated = activated;
+    }
+
+}
diff --git a/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/dao/ActivatableEntityDAO.java b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/dao/ActivatableEntityDAO.java
new file mode 100644
index 00000000..1f50b0c3
--- /dev/null
+++ b/src/main/java/ch/ethz/seb/sebserver/webservice/servicelayer/dao/ActivatableEntityDAO.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2018 ETH Zürich, Educational Development and Technology (LET)
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+package ch.ethz.seb.sebserver.webservice.servicelayer.dao;
+
+import java.util.Collection;
+
+import ch.ethz.seb.sebserver.gbl.model.Entity;
+import ch.ethz.seb.sebserver.gbl.util.Result;
+
+/** Interface of a DAO for an Entity that has activation feature.
+ *
+ * @param <T> the concrete Entity type */
+public interface ActivatableEntityDAO<T> {
+
+    /** Get a Collection of all active Entity instances for a concrete entity-domain.
+     *
+     * @return A Result refer to a Collection of all active Entity instances for a concrete entity-domain
+     *         or refer to an error if happened */
+    Result<Collection<T>> allActive();
+
+    /** Set the entity with specified identifier active / inactive
+     *
+     * @param entityId The Entity identifier
+     * @param active The active flag
+     * @return A Result refer to the Entity instance or refer to an error if happened */
+    Result<T> setActive(String entityId, boolean active);
+
+    /** Get notified if some Entity instance has been activated
+     * This can be used to take action in dependency of an activation of an Entity of different type.
+     * For example a user-account DAO want to react on a Institution activation to also activate all user
+     * accounts for this institution.
+     * 
+     * @param source The source Entity that has been activated */
+    void notifyActivation(Entity source);
+
+    /** Get notified if some Entity instance has been deactivated
+     * This can be used to take action in dependency of an deactivation of an Entity of different type.
+     * For example a user-account DAO want to react on a Institution deactivation to also deactivate all user
+     * accounts for this institution.
+     * 
+     * @param source The source Entity that has been deactivated */
+    void notifyDeactivation(Entity source);
+
+}