diff --git a/components/application-mgt/org.wso2.carbon.device.application.mgt.common/src/main/java/org/wso2/carbon/device/application/mgt/common/services/SubscriptionManager.java b/components/application-mgt/org.wso2.carbon.device.application.mgt.common/src/main/java/org/wso2/carbon/device/application/mgt/common/services/SubscriptionManager.java
index 6f207e3f4d..fbfa32a2c8 100644
--- a/components/application-mgt/org.wso2.carbon.device.application.mgt.common/src/main/java/org/wso2/carbon/device/application/mgt/common/services/SubscriptionManager.java
+++ b/components/application-mgt/org.wso2.carbon.device.application.mgt.common/src/main/java/org/wso2/carbon/device/application/mgt/common/services/SubscriptionManager.java
@@ -42,10 +42,10 @@ public interface SubscriptionManager {
      * To install an application to given list of users.
      * @param applicationUUID Application ID
      * @param userList User list
-     * @return Failed User List which the application was unable to install
+     * @return Failed Device List which the application was unable to install
      * @throws ApplicationManagementException Application Management Exception
      */
-    List<String> installApplicationForUsers(String applicationUUID,
+    List<DeviceIdentifier> installApplicationForUsers(String applicationUUID,
                                             List<String> userList)
             throws ApplicationManagementException;
 
@@ -53,10 +53,10 @@ public interface SubscriptionManager {
      * To install an application to given list of users.
      * @param applicationUUID Application ID
      * @param roleList Role list
-     * @return Failed Role List which the application was unable to install
+     * @return Failed Device List which the application was unable to install
      * @throws ApplicationManagementException Application Management Exception
      */
-    List<String> installApplicationForRoles(String applicationUUID,
+    List<DeviceIdentifier> installApplicationForRoles(String applicationUUID,
                                             List<String> roleList)
             throws ApplicationManagementException;
 
diff --git a/components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/impl/SubscriptionManagerImpl.java b/components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/impl/SubscriptionManagerImpl.java
index 07eedb1980..ed103814b2 100644
--- a/components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/impl/SubscriptionManagerImpl.java
+++ b/components/application-mgt/org.wso2.carbon.device.application.mgt.core/src/main/java/org/wso2/carbon/device/application/mgt/core/impl/SubscriptionManagerImpl.java
@@ -19,16 +19,21 @@ package org.wso2.carbon.device.application.mgt.core.impl;
 
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
+import org.wso2.carbon.context.PrivilegedCarbonContext;
 import org.wso2.carbon.device.application.mgt.common.DeviceIdentifier;
 import org.wso2.carbon.device.application.mgt.common.exception.ApplicationManagementException;
 import org.wso2.carbon.device.application.mgt.common.services.SubscriptionManager;
 import org.wso2.carbon.device.application.mgt.core.dao.common.DAOFactory;
+import org.wso2.carbon.device.application.mgt.core.internal.DataHolder;
+import org.wso2.carbon.device.mgt.common.Device;
+import org.wso2.carbon.device.mgt.common.DeviceManagementException;
 import org.wso2.carbon.device.mgt.core.dao.DeviceManagementDAOException;
 import org.wso2.carbon.device.mgt.core.dao.DeviceManagementDAOFactory;
 
 import java.sql.SQLException;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.stream.Collectors;
 
 /**
  * This is the default implementation for the Subscription Manager.
@@ -36,13 +41,69 @@ import java.util.List;
 public class SubscriptionManagerImpl implements SubscriptionManager {
 
     private static final Log log = LogFactory.getLog(SubscriptionManagerImpl.class);
+    final private String ANDROID = "android";
+    final private String IOS = "ios";
 
     @Override
     public List<DeviceIdentifier> installApplicationForDevices(String applicationUUID,
                                                                List<DeviceIdentifier> deviceList)
             throws ApplicationManagementException {
         log.info("Install application: " + applicationUUID + " to: " + deviceList.size() + " devices.");
+        List<DeviceIdentifier> failedDevices = installApplication(applicationUUID, deviceList);
+        return failedDevices;
+    }
+
+    @Override
+    public List<DeviceIdentifier> installApplicationForUsers(String applicationUUID, List<String> userList)
+            throws ApplicationManagementException {
+        log.info("Install application: " + applicationUUID + " to: " + userList.size() + " users.");
+        List<DeviceIdentifier> deviceList = new ArrayList<>();
+        int tenantId = PrivilegedCarbonContext.getThreadLocalCarbonContext().getTenantId();
+        for (String user : userList) {
+            try {
+                List<Device> devicesOfUser = DeviceManagementDAOFactory.getDeviceDAO().getDevicesOfUser(user, tenantId);
+                for (Device device : devicesOfUser) {
+                    deviceList.add(new DeviceIdentifier(device
+                            .getDeviceIdentifier(), device.getType()));
+                }
+            } catch (DeviceManagementDAOException e) {
+                log.error("Error when extracting the device list from user[" + user + "].", e);
+            }
+        }
+        return installApplication(applicationUUID, deviceList);
+    }
+
+    @Override
+    public List<DeviceIdentifier> installApplicationForRoles(String applicationUUID, List<String> roleList)
+            throws ApplicationManagementException {
+        log.info("Install application: " + applicationUUID + " to: " + roleList.size() + " roles.");
+        List<DeviceIdentifier> deviceList = new ArrayList<>();
+        for (String role : roleList) {
+            try {
+                List<Device> devicesOfRole = DataHolder.getInstance().getDeviceManagementService().getAllDevicesOfRole(role);
+                for (Device device : devicesOfRole) {
+                    deviceList.add(new DeviceIdentifier(device
+                            .getDeviceIdentifier(), device.getType()));
+                }
+            } catch (DeviceManagementException e) {
+                log.error("Error when extracting the device list from role[" + role + "].", e);
+            }
+        }
+        return installApplication(applicationUUID, deviceList);
+    }
+
+    @Override
+    public List<DeviceIdentifier> uninstallApplication(String applicationUUID,
+                                                       List<DeviceIdentifier> deviceList)
+            throws ApplicationManagementException {
+        return null;
+    }
+
+    private List<DeviceIdentifier> installApplication(String applicationUUID, List<DeviceIdentifier> deviceList)
+            throws ApplicationManagementException {
         List<DeviceIdentifier> failedDeviceList = new ArrayList<>(deviceList);
+        List<org.wso2.carbon.device.mgt.common.DeviceIdentifier> androidDevices = new ArrayList<>();
+        List<org.wso2.carbon.device.mgt.common.DeviceIdentifier> iosDevices = new ArrayList<>();
         for (DeviceIdentifier device : deviceList) {
             org.wso2.carbon.device.mgt.common.DeviceIdentifier deviceIdentifier = new org.wso2.carbon.device.mgt
                     .common.DeviceIdentifier(device.getId(), device.getType());
@@ -52,9 +113,13 @@ public class SubscriptionManagerImpl implements SubscriptionManager {
                     log.error("Device with ID: " + device.getId() + " not found to install the application.");
                 } else {
                     if (log.isDebugEnabled()) {
-                        log.debug("Installing application to : " + device.getId());
+                        log.debug("Prepare application install to : " + device.getId());
+                    }
+                    if (device.getType().equals(ANDROID)) {
+                        androidDevices.add(deviceIdentifier);
+                    } else {
+                        iosDevices.add(deviceIdentifier);
                     }
-                    //Todo: generating one time download link for the application and put install operation to device.
                     DAOFactory.getSubscriptionDAO().addDeviceApplicationMapping(device.getId(), applicationUUID, false);
                     failedDeviceList.remove(device);
                 }
@@ -64,35 +129,7 @@ public class SubscriptionManagerImpl implements SubscriptionManager {
                 DeviceManagementDAOFactory.closeConnection();
             }
         }
+        //Todo: generating one time download link for the application and put install operation to devices.
         return failedDeviceList;
     }
-
-    @Override
-    public List<String> installApplicationForUsers(String applicationUUID, List<String> userList)
-            throws ApplicationManagementException {
-        log.info("Install application: " + applicationUUID + " to: " + userList.size() + " users.");
-        for (String user : userList) {
-            //Todo: implementation
-            //Todo: get the device list and call installApplicationForDevices
-        }
-        return userList;
-    }
-
-    @Override
-    public List<String> installApplicationForRoles(String applicationUUID, List<String> roleList)
-            throws ApplicationManagementException {
-        log.info("Install application: " + applicationUUID + " to: " + roleList.size() + " users.");
-        for (String role : roleList) {
-            //Todo: implementation
-            //Todo: get the device list and call installApplicationForDevices
-        }
-        return roleList;
-    }
-
-    @Override
-    public List<DeviceIdentifier> uninstallApplication(String applicationUUID,
-                                                       List<DeviceIdentifier> deviceList)
-            throws ApplicationManagementException {
-        return null;
-    }
 }