diff --git a/src/main/java/edu/group5/app/control/Wrapper.java b/src/main/java/edu/group5/app/control/Wrapper.java
index 9655c26..56efc11 100644
--- a/src/main/java/edu/group5/app/control/Wrapper.java
+++ b/src/main/java/edu/group5/app/control/Wrapper.java
@@ -1,5 +1,10 @@
 package edu.group5.app.control;
 
-public class Wrapper {
-  
+abstract class Wrapper {
+  protected Object data;
+
+  protected Wrapper() {
+  }
+
+  public abstract boolean importData();
 }