diff --git a/app/src/main/java/com/example/sprout/refactor/viewmodel/BaseViewModel.java b/app/src/main/java/com/example/sprout/refactor/viewmodel/BaseViewModel.java
index c2b107c..1300820 100644
--- a/app/src/main/java/com/example/sprout/refactor/viewmodel/BaseViewModel.java
+++ b/app/src/main/java/com/example/sprout/refactor/viewmodel/BaseViewModel.java
@@ -4,6 +4,11 @@
 import android.arch.lifecycle.LifecycleObserver;
 import android.arch.lifecycle.OnLifecycleEvent;
 
+import com.example.sprout.refactor.messengers.NavigationMessage;
+import com.example.sprout.refactor.messengers.ToastMessage;
+import com.example.sprout.refactor.notification.Observable;
+import com.example.sprout.refactor.notification.Observer;
+
 /**
  * Base ViewModel
  *
@@ -11,6 +16,19 @@
  */
 public abstract class BaseViewModel implements LifecycleObserver {
 
+    protected Observable<NavigationMessage> navigationObservable = new Observable<>();
+    protected Observable<ToastMessage> toastObservable = new Observable<>();
+
+    public void addObserver(Observer<NavigationMessage> navigationObserver, Observer<ToastMessage> toastObserver) {
+        navigationObservable.addObserver(navigationObserver);
+        toastObservable.addObserver(toastObserver);
+    }
+
+    public void removeObserver(Observer<NavigationMessage> navigationObserver, Observer<ToastMessage> toastObserver) {
+        navigationObservable.removeObserver(navigationObserver);
+        toastObservable.removeObserver(toastObserver);
+    }
+
     @OnLifecycleEvent(Lifecycle.Event.ON_CREATE)
     public void onCreate() {
     }