diff --git a/src/seedu/addressbook/Main.java b/src/seedu/addressbook/Main.java
index fca4d5d1d..3925fbb19 100644
--- a/src/seedu/addressbook/Main.java
+++ b/src/seedu/addressbook/Main.java
@@ -14,7 +14,7 @@
 public class Main extends Application implements Stoppable{
 
     /** Version info of the program. */
-    public static final String VERSION = "AddressBook Level 3 - Version 1.0";
+    public static final String VERSION = "AddessBook Level 3 - Version 1.0";
 
     private Gui gui;
 
diff --git a/src/seedu/addressbook/commands/AddCommand.java b/src/seedu/addressbook/commands/AddCommand.java
index b0f202d42..8d5e4ef33 100644
--- a/src/seedu/addressbook/commands/AddCommand.java
+++ b/src/seedu/addressbook/commands/AddCommand.java
@@ -67,4 +67,8 @@ public CommandResult execute() {
         }
     }
 
+    @Override
+    public boolean isMutating() {
+        return true;
+    }
 }
diff --git a/src/seedu/addressbook/commands/ClearCommand.java b/src/seedu/addressbook/commands/ClearCommand.java
index 330146aaa..f03cc01a7 100644
--- a/src/seedu/addressbook/commands/ClearCommand.java
+++ b/src/seedu/addressbook/commands/ClearCommand.java
@@ -16,4 +16,9 @@ public CommandResult execute() {
         addressBook.clear();
         return new CommandResult(MESSAGE_SUCCESS);
     }
+
+    @Override
+    public boolean isMutating() {
+        return true;
+    }
 }
diff --git a/src/seedu/addressbook/commands/Command.java b/src/seedu/addressbook/commands/Command.java
index a54cbcb5b..ed97f0ce9 100644
--- a/src/seedu/addressbook/commands/Command.java
+++ b/src/seedu/addressbook/commands/Command.java
@@ -70,4 +70,8 @@ public int getTargetIndex() {
     public void setTargetIndex(int targetIndex) {
         this.targetIndex = targetIndex;
     }
+
+    public boolean isMutating() {
+        return true;
+    }
 }
diff --git a/src/seedu/addressbook/commands/DeleteCommand.java b/src/seedu/addressbook/commands/DeleteCommand.java
index 1dd78f85e..00b8facf9 100644
--- a/src/seedu/addressbook/commands/DeleteCommand.java
+++ b/src/seedu/addressbook/commands/DeleteCommand.java
@@ -39,4 +39,8 @@ public CommandResult execute() {
         }
     }
 
+    @Override
+    public boolean isMutating() {
+        return true;
+    }
 }
diff --git a/src/seedu/addressbook/commands/ExitCommand.java b/src/seedu/addressbook/commands/ExitCommand.java
index 0585451f1..d0c84ce23 100644
--- a/src/seedu/addressbook/commands/ExitCommand.java
+++ b/src/seedu/addressbook/commands/ExitCommand.java
@@ -16,4 +16,8 @@ public CommandResult execute() {
         return new CommandResult(MESSAGE_EXIT_ACKNOWEDGEMENT);
     }
 
+    @Override
+    public boolean isMutating() {
+        return false;
+    }
 }
diff --git a/src/seedu/addressbook/commands/FindCommand.java b/src/seedu/addressbook/commands/FindCommand.java
index c8e9a380f..b64688115 100644
--- a/src/seedu/addressbook/commands/FindCommand.java
+++ b/src/seedu/addressbook/commands/FindCommand.java
@@ -36,6 +36,11 @@ public CommandResult execute() {
         return new CommandResult(getMessageForPersonListShownSummary(personsFound), personsFound);
     }
 
+    @Override
+    public boolean isMutating() {
+        return false;
+    }
+
     /**
      * Retrieve all persons in the address book whose names contain some of the specified keywords.
      *
diff --git a/src/seedu/addressbook/commands/HelpCommand.java b/src/seedu/addressbook/commands/HelpCommand.java
index ef2ed7d0e..ac40681e6 100644
--- a/src/seedu/addressbook/commands/HelpCommand.java
+++ b/src/seedu/addressbook/commands/HelpCommand.java
@@ -25,4 +25,9 @@ public class HelpCommand extends Command {
     public CommandResult execute() {
         return new CommandResult(MESSAGE_ALL_USAGES);
     }
+
+    @Override
+    public boolean isMutating() {
+        return false;
+    }
 }
diff --git a/src/seedu/addressbook/commands/IncorrectCommand.java b/src/seedu/addressbook/commands/IncorrectCommand.java
index 81abba7a1..b225fea14 100644
--- a/src/seedu/addressbook/commands/IncorrectCommand.java
+++ b/src/seedu/addressbook/commands/IncorrectCommand.java
@@ -17,4 +17,9 @@ public CommandResult execute() {
         return new CommandResult(feedbackToUser);
     }
 
+    @Override
+    public boolean isMutating() {
+        return false;
+    }
+
 }
diff --git a/src/seedu/addressbook/commands/ListCommand.java b/src/seedu/addressbook/commands/ListCommand.java
index cb604a8e9..a53ac2c5c 100644
--- a/src/seedu/addressbook/commands/ListCommand.java
+++ b/src/seedu/addressbook/commands/ListCommand.java
@@ -22,4 +22,9 @@ public CommandResult execute() {
         List<ReadOnlyPerson> allPersons = addressBook.getAllPersons().immutableListView();
         return new CommandResult(getMessageForPersonListShownSummary(allPersons), allPersons);
     }
+
+    @Override
+    public boolean isMutating() {
+        return false;
+    }
 }
diff --git a/src/seedu/addressbook/commands/ViewAllCommand.java b/src/seedu/addressbook/commands/ViewAllCommand.java
index ed2c16e83..eddb21ca9 100644
--- a/src/seedu/addressbook/commands/ViewAllCommand.java
+++ b/src/seedu/addressbook/commands/ViewAllCommand.java
@@ -37,4 +37,9 @@ public CommandResult execute() {
             return new CommandResult(Messages.MESSAGE_INVALID_PERSON_DISPLAYED_INDEX);
         }
     }
+
+    @Override
+    public boolean isMutating() {
+        return false;
+    }
 }
diff --git a/src/seedu/addressbook/commands/ViewCommand.java b/src/seedu/addressbook/commands/ViewCommand.java
index 1058c4b52..85c49c5f6 100644
--- a/src/seedu/addressbook/commands/ViewCommand.java
+++ b/src/seedu/addressbook/commands/ViewCommand.java
@@ -38,4 +38,8 @@ public CommandResult execute() {
         }
     }
 
+    @Override
+    public boolean isMutating() {
+        return false;
+    }
 }
diff --git a/src/seedu/addressbook/logic/Logic.java b/src/seedu/addressbook/logic/Logic.java
index 17afd61a0..93451f705 100644
--- a/src/seedu/addressbook/logic/Logic.java
+++ b/src/seedu/addressbook/logic/Logic.java
@@ -85,7 +85,9 @@ public CommandResult execute(String userCommandText) throws Exception {
     private CommandResult execute(Command command) throws Exception {
         command.setData(addressBook, lastShownList);
         CommandResult result = command.execute();
-        storage.save(addressBook);
+        if (command.isMutating()){
+            storage.save(addressBook);
+        }
         return result;
     }
 
diff --git a/test/java/seedu/addressbook/logic/LogicTest.java b/test/java/seedu/addressbook/logic/LogicTest.java
index 7efa921ca..70f1eff9c 100644
--- a/test/java/seedu/addressbook/logic/LogicTest.java
+++ b/test/java/seedu/addressbook/logic/LogicTest.java
@@ -12,6 +12,7 @@
 import seedu.addressbook.data.person.*;
 import seedu.addressbook.data.tag.Tag;
 import seedu.addressbook.data.tag.UniqueTagList;
+import seedu.addressbook.parser.Parser;
 import seedu.addressbook.storage.StorageFile;
 
 import java.util.*;
@@ -90,7 +91,9 @@ private void assertCommandBehavior(String inputCommand,
         //Confirm the state of data is as expected
         assertEquals(expectedAddressBook, addressBook);
         assertEquals(lastShownList, logic.getLastShownList());
-        assertEquals(addressBook, saveFile.load());
+        if (new Parser().parseCommand(inputCommand).isMutating()){
+            assertEquals(addressBook, saveFile.load());
+        }
     }