diff --git a/src/seedu/addressbook/commands/AddCommand.java b/src/seedu/addressbook/commands/AddCommand.java
index 78ad0da21..f98e4f8dd 100644
--- a/src/seedu/addressbook/commands/AddCommand.java
+++ b/src/seedu/addressbook/commands/AddCommand.java
@@ -5,6 +5,7 @@
 import seedu.addressbook.data.tag.Tag;
 
 import java.util.HashSet;
+import java.util.List;
 import java.util.Set;
 
 /**
@@ -60,7 +61,8 @@ public ReadOnlyPerson getPerson() {
     public CommandResult execute() {
         try {
             addressBook.addPerson(toAdd);
-            return new CommandResult(String.format(MESSAGE_SUCCESS, toAdd));
+            List<ReadOnlyPerson> allPersons = addressBook.getAllPersons().immutableListView();
+            return new CommandResult(String.format(MESSAGE_SUCCESS, toAdd), allPersons);
         } catch (UniquePersonList.DuplicatePersonException dpe) {
             return new CommandResult(MESSAGE_DUPLICATE_PERSON);
         }
diff --git a/src/seedu/addressbook/commands/Command.java b/src/seedu/addressbook/commands/Command.java
index a54cbcb5b..a74002c13 100644
--- a/src/seedu/addressbook/commands/Command.java
+++ b/src/seedu/addressbook/commands/Command.java
@@ -39,13 +39,15 @@ public static String getMessageForPersonListShownSummary(List<? extends ReadOnly
     /**
      * Executes the command and returns the result.
      */
-    public CommandResult execute(){
-        throw new UnsupportedOperationException("This method should be implement in child classes");
-    }
+//    public CommandResult execute(){
+//        throw new UnsupportedOperationException("This method should be implement in child classes");
+//    }
 
     //Note: it is better to make the execute() method abstract, by replacing the above method with the line below:
     //public abstract CommandResult execute();
 
+    public abstract CommandResult execute();
+
     /**
      * Supplies the data the command will operate on.
      */
@@ -70,4 +72,9 @@ public int getTargetIndex() {
     public void setTargetIndex(int targetIndex) {
         this.targetIndex = targetIndex;
     }
+
+    public boolean isMutating(String userCommandText) {
+        if(userCommandText == "add" || userCommandText == "delete") return true;
+        else return false;
+    }
 }
diff --git a/src/seedu/addressbook/commands/DeleteCommand.java b/src/seedu/addressbook/commands/DeleteCommand.java
index 1dd78f85e..ebf3014ad 100644
--- a/src/seedu/addressbook/commands/DeleteCommand.java
+++ b/src/seedu/addressbook/commands/DeleteCommand.java
@@ -4,6 +4,8 @@
 import seedu.addressbook.data.person.ReadOnlyPerson;
 import seedu.addressbook.data.person.UniquePersonList.PersonNotFoundException;
 
+import java.util.List;
+
 
 /**
  * Deletes a person identified using it's last displayed index from the address book.
@@ -30,7 +32,8 @@ public CommandResult execute() {
         try {
             final ReadOnlyPerson target = getTargetPerson();
             addressBook.removePerson(target);
-            return new CommandResult(String.format(MESSAGE_DELETE_PERSON_SUCCESS, target));
+            List<ReadOnlyPerson> allPersons = addressBook.getAllPersons().immutableListView();
+            return new CommandResult(String.format(MESSAGE_DELETE_PERSON_SUCCESS, target), allPersons);
 
         } catch (IndexOutOfBoundsException ie) {
             return new CommandResult(Messages.MESSAGE_INVALID_PERSON_DISPLAYED_INDEX);
diff --git a/src/seedu/addressbook/ui/DarkTheme.css b/src/seedu/addressbook/ui/DarkTheme.css
index 9e6314894..723ca0d96 100644
--- a/src/seedu/addressbook/ui/DarkTheme.css
+++ b/src/seedu/addressbook/ui/DarkTheme.css
@@ -4,13 +4,13 @@
     -fx-font-size: 12pt;
     -fx-font-family: "Consolas";
     -fx-font-weight: bold;
-    -fx-text-fill: yellow;
+    -fx-text-fill: orange;
     -fx-control-inner-background: derive(#1d1d1d,20%);
 }
 
 .text-area {
-    -fx-background-color: black;
-    -fx-control-inner-background: black;
+    -fx-background-color: pink;
+    -fx-control-inner-background: lightblue;
     -fx-font-family: "Segoe UI Semibold";
     -fx-font-size: 10pt;
     -fx-padding: 5 5 5 5;
diff --git a/src/seedu/addressbook/ui/MainWindow.java b/src/seedu/addressbook/ui/MainWindow.java
index 1fdde2a4f..d2be41f4e 100644
--- a/src/seedu/addressbook/ui/MainWindow.java
+++ b/src/seedu/addressbook/ui/MainWindow.java
@@ -80,6 +80,7 @@ public void clearOutputConsole(){
     /** Displays the result of a command execution to the user. */
     public void displayResult(CommandResult result) {
         clearOutputConsole();
+        outputConsole.setText("List of Contact(s) found: \n");
         final Optional<List<? extends ReadOnlyPerson>> resultPersons = result.getRelevantPersons();
         if(resultPersons.isPresent()) {
             display(resultPersons.get());
diff --git a/test/java/seedu/addressbook/logic/LogicTest.java b/test/java/seedu/addressbook/logic/LogicTest.java
index 396fb4bc9..11faa1768 100644
--- a/test/java/seedu/addressbook/logic/LogicTest.java
+++ b/test/java/seedu/addressbook/logic/LogicTest.java
@@ -157,7 +157,7 @@ public void execute_add_successful() throws Exception {
         assertCommandBehavior(helper.generateAddCommand(toBeAdded),
                               String.format(AddCommand.MESSAGE_SUCCESS, toBeAdded),
                               expectedAB,
-                              false,
+                              true,
                               Collections.emptyList());
 
     }