diff --git a/model/src/main/java/one/nem/kidshift/model/callback/ChildModelCallback.java b/model/src/main/java/one/nem/kidshift/model/callback/ChildModelCallback.java
new file mode 100644
index 0000000..a6e622d
--- /dev/null
+++ b/model/src/main/java/one/nem/kidshift/model/callback/ChildModelCallback.java
@@ -0,0 +1,11 @@
+package one.nem.kidshift.model.callback;
+
+import java.util.List;
+
+import one.nem.kidshift.model.ChildModel;
+
+public interface ChildModelCallback {
+    void onUnchanged();
+    void onUpdated(List<ChildModel> childModelList);
+    void onFailed(String message);
+}
\ No newline at end of file