diff --git a/Source/BusinessClass/CheckBoxQuestion.php b/Source/BusinessClass/CheckBoxQuestion.php
index 7de2935..42a8251 100644
--- a/Source/BusinessClass/CheckBoxQuestion.php
+++ b/Source/BusinessClass/CheckBoxQuestion.php
@@ -4,9 +4,9 @@ namespace BusinessClass;
 
 class CheckBoxQuestion extends BoxQuestion
 {
-    public function responseStrategy()
+    public function responseStrategy(): void
     {
-        return;
+        echo "Implement responseStrategy() method.";
     }
 
     public function printStrategy(): string
diff --git a/Source/BusinessClass/ListBoxQuestion.php b/Source/BusinessClass/ListBoxQuestion.php
index 68306ac..186b179 100644
--- a/Source/BusinessClass/ListBoxQuestion.php
+++ b/Source/BusinessClass/ListBoxQuestion.php
@@ -4,9 +4,9 @@ namespace BusinessClass;
 
 class ListBoxQuestion extends BoxQuestion
 {
-    public function responseStrategy()
+    public function responseStrategy(): void
     {
-        // TODO: Implement responseStrategy() method.
+        echo "Implement responseStrategy() method.";
     }
 
     public function printStrategy(): string
diff --git a/Source/BusinessClass/TextQuestion.php b/Source/BusinessClass/TextQuestion.php
index 6a04675..8dab852 100644
--- a/Source/BusinessClass/TextQuestion.php
+++ b/Source/BusinessClass/TextQuestion.php
@@ -13,9 +13,9 @@ class TextQuestion extends Question
         parent::__construct($id, $content);
     }
 
-    public function responseStrategy()
+    public function responseStrategy(): void
     {
-        // TODO: Implement responseStrategy() method.
+        echo "Implement responseStrategy() method.";
     }
 
     /**