diff --git a/src/main/java/seedu/address/model/person/Person.java b/src/main/java/seedu/address/model/person/Person.java
index 8286d0247b0..9689f6873dc 100644
--- a/src/main/java/seedu/address/model/person/Person.java
+++ b/src/main/java/seedu/address/model/person/Person.java
@@ -109,16 +109,14 @@ public Set<Tag> getTags() {
     }
 
     /**
-     * Returns true if both persons have the same name.
-     * This defines a weaker notion of equality between two persons.
+     * Returns true if both persons are the same.
      */
     public boolean isSamePerson(Person otherPerson) {
         if (otherPerson == this) {
             return true;
         }
 
-        return otherPerson != null
-                && otherPerson.getName().equals(getName());
+        return this.equals(otherPerson);
     }
 
     /**
@@ -138,9 +136,9 @@ public boolean equals(Object other) {
 
         Person otherPerson = (Person) other;
         return name.equals(otherPerson.name)
-                && phone.equals(otherPerson.phone)
-                && email.equals(otherPerson.email)
-                && address.equals(otherPerson.address);
+                && dob.equals(otherPerson.dob)
+                && address.equals(otherPerson.address)
+                && (phone.equals(otherPerson.phone) || email.equals(otherPerson.email));
     }
 
     @Override
diff --git a/src/test/data/JsonSerializableAddressBookTest/duplicatePersonAddressBook.json b/src/test/data/JsonSerializableAddressBookTest/duplicatePersonAddressBook.json
index e5f05b9f1eb..3137e316c63 100644
--- a/src/test/data/JsonSerializableAddressBookTest/duplicatePersonAddressBook.json
+++ b/src/test/data/JsonSerializableAddressBookTest/duplicatePersonAddressBook.json
@@ -15,7 +15,7 @@
       "name": "Alice Pauline",
       "phone": "94351253",
       "email": "pauline@example.com",
-      "address": "4th street",
+      "address": "123, Jurong West Ave 6, #08-111",
       "salary": "100000",
       "claimBudget": "1",
       "department": "Finance",
diff --git a/src/test/java/seedu/address/model/AddressBookTest.java b/src/test/java/seedu/address/model/AddressBookTest.java
index 68c8c5ba4d5..fceb14f3608 100644
--- a/src/test/java/seedu/address/model/AddressBookTest.java
+++ b/src/test/java/seedu/address/model/AddressBookTest.java
@@ -9,17 +9,14 @@
 import static seedu.address.testutil.TypicalPersons.ALICE;
 import static seedu.address.testutil.TypicalPersons.getTypicalAddressBook;
 
-import java.util.Arrays;
 import java.util.Collection;
 import java.util.Collections;
-import java.util.List;
 
 import org.junit.jupiter.api.Test;
 
 import javafx.collections.FXCollections;
 import javafx.collections.ObservableList;
 import seedu.address.model.person.Person;
-import seedu.address.model.person.exceptions.DuplicatePersonException;
 import seedu.address.testutil.PersonBuilder;
 
 public class AddressBookTest {
@@ -43,17 +40,6 @@ public void resetData_withValidReadOnlyAddressBook_replacesData() {
         assertEquals(newData, addressBook);
     }
 
-    @Test
-    public void resetData_withDuplicatePersons_throwsDuplicatePersonException() {
-        // Two persons with the same identity fields
-        Person editedAlice = new PersonBuilder(ALICE).withAddress(VALID_ADDRESS_BOB).withTags(VALID_TAG_HUSBAND)
-                .build();
-        List<Person> newPersons = Arrays.asList(ALICE, editedAlice);
-        AddressBookStub newData = new AddressBookStub(newPersons);
-
-        assertThrows(DuplicatePersonException.class, () -> addressBook.resetData(newData));
-    }
-
     @Test
     public void hasPerson_nullPerson_throwsNullPointerException() {
         assertThrows(NullPointerException.class, () -> addressBook.hasPerson(null));
@@ -75,7 +61,7 @@ public void hasPerson_personWithSameIdentityFieldsInAddressBook_returnsTrue() {
         addressBook.addPerson(ALICE);
         Person editedAlice = new PersonBuilder(ALICE).withAddress(VALID_ADDRESS_BOB).withTags(VALID_TAG_HUSBAND)
                 .build();
-        assertTrue(addressBook.hasPerson(editedAlice));
+        assertFalse(addressBook.hasPerson(editedAlice));
     }
 
     @Test
diff --git a/src/test/java/seedu/address/model/person/PersonTest.java b/src/test/java/seedu/address/model/person/PersonTest.java
index d13aa03d41b..9ce43efc670 100644
--- a/src/test/java/seedu/address/model/person/PersonTest.java
+++ b/src/test/java/seedu/address/model/person/PersonTest.java
@@ -27,10 +27,9 @@ public void isSamePerson() {
         // null -> returns false
         assertFalse(ALICE.isSamePerson(null));
 
-        // same name, all other attributes different -> returns true
         Person editedAlice = new PersonBuilder(ALICE).withPhone(VALID_PHONE_BOB).withEmail(VALID_EMAIL_BOB)
                 .withAddress(VALID_ADDRESS_BOB).withTags(VALID_TAG_HUSBAND).build();
-        assertTrue(ALICE.isSamePerson(editedAlice));
+        assertFalse(ALICE.isSamePerson(editedAlice));
 
         // different name, all other attributes same -> returns false
         editedAlice = new PersonBuilder(ALICE).withName(VALID_NAME_BOB).build();
@@ -72,13 +71,13 @@ public void equals() {
         Person editedAlice = new PersonBuilder(ALICE).withName(VALID_NAME_BOB).build();
         assertFalse(ALICE.equals(editedAlice));
 
-        // different phone -> returns false
+        // different phone -> returns true
         editedAlice = new PersonBuilder(ALICE).withPhone(VALID_PHONE_BOB).build();
-        assertFalse(ALICE.equals(editedAlice));
+        assertTrue(ALICE.equals(editedAlice));
 
-        // different email -> returns false
+        // different email -> returns true
         editedAlice = new PersonBuilder(ALICE).withEmail(VALID_EMAIL_BOB).build();
-        assertFalse(ALICE.equals(editedAlice));
+        assertTrue(ALICE.equals(editedAlice));
 
         // different address -> returns false
         editedAlice = new PersonBuilder(ALICE).withAddress(VALID_ADDRESS_BOB).build();
diff --git a/src/test/java/seedu/address/model/person/UniquePersonListTest.java b/src/test/java/seedu/address/model/person/UniquePersonListTest.java
index 17ae501df08..b4a8ef50089 100644
--- a/src/test/java/seedu/address/model/person/UniquePersonListTest.java
+++ b/src/test/java/seedu/address/model/person/UniquePersonListTest.java
@@ -4,6 +4,7 @@
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
 import static seedu.address.logic.commands.CommandTestUtil.VALID_ADDRESS_BOB;
+import static seedu.address.logic.commands.CommandTestUtil.VALID_PHONE_BOB;
 import static seedu.address.logic.commands.CommandTestUtil.VALID_TAG_HUSBAND;
 import static seedu.address.testutil.Assert.assertThrows;
 import static seedu.address.testutil.TypicalPersons.ALICE;
@@ -42,7 +43,7 @@ public void contains_personInList_returnsTrue() {
     @Test
     public void contains_personWithSameIdentityFieldsInList_returnsTrue() {
         uniquePersonList.add(ALICE);
-        Person editedAlice = new PersonBuilder(ALICE).withAddress(VALID_ADDRESS_BOB).withTags(VALID_TAG_HUSBAND)
+        Person editedAlice = new PersonBuilder(ALICE).withPhone(VALID_PHONE_BOB).withTags(VALID_TAG_HUSBAND)
                 .build();
         assertTrue(uniquePersonList.contains(editedAlice));
     }