Merge pull request #357

Justify the rules for duplicate

docs/DeveloperGuide.md

@@ -391,7 +391,8 @@ Priorities: High (must have) - `* * *`, Medium (nice to have) - `* *`, Low (unli
 
       Use case ends.
 
-**Use case: UC04 - Add tags to a contact**
+**Use case: UC04 - Add tags to a contact**  
+
 **Precondition**: Contact to add tags to already exists
 
 **MSS**
@@ -417,7 +418,8 @@ Priorities: High (must have) - `* * *`, Medium (nice to have) - `* *`, Low (unli
 
       Use case ends.
 
-**Use cases: UC05 - Delete a tag from a contact**
+**Use case: UC05 - Delete a tag from a contact**  
+
 **Precondition**: Contact to delete a tag from already exists
 
 **MSS**
@@ -442,7 +444,7 @@ Priorities: High (must have) - `* * *`, Medium (nice to have) - `* *`, Low (unli
 
       Use case ends.
 
-**Use cases: UC06 - Undo an execution of command**
+**Use case: UC06 - Undo an execution of command**
 **Precondition**: At least one valid command has been executed by the user.
 
 **MSS**
@@ -456,7 +458,7 @@ before the command was executed.
 * 1a. No earlier data to revert.
     * 1a1. CampusConnect shows error message.
 
-      Use cases ends.
+      Use case ends.
 
 **Use Case: UC07 - Redo Command Execution**
 
@@ -491,7 +493,9 @@ before the command was executed.
 * **Field**: An attribute possessed by a contact, namely Phone number, Tags, Name and Email.
 * **Prefix**: An identifier used in commands to indicate which field is referred to. For the 4 fields Phone, Name, Tags and Email,
     the *prefixes* would be `p/`, `t/`, `n/` and `e/` respectively.
-* **Duplicate Contact**: A contact that has the same Phone, Email or Name as another contact.
+* **Duplicate Contact**: A contact is considered a duplicate if it shares the same phone number, email, or name with another contact. 
+    Phone numbers and emails are unique identifiers, so allowing duplicates could cause confusion, such as accidentally contacting the wrong person. 
+    Unique names also help maintain organization, with small variations (e.g., capitalization or adding a number) used to distinguish individuals with the same name.
 * **Tag List**: The scrollable list in the GUI displaying all unique tags and their colour-coded categories. The execution of `find` commands do not change the content of tag lists. 
 * **Person List**: The scrollable list of contacts in the GUI displaying all contacts and the respective values for their fields.
 * **Commands affected by `undo` and `redo`**: These refer to all commands that affect the *state* of the Tag List and Contact List

docs/UserGuide.md

@@ -77,6 +77,7 @@ any traditional point-and-click management app.
 
 **Notes about duplicate contacts:**<br>
 * A contact is considered a duplicate of another if it has the same Name, Phone or Email as the other contact.
+* 
 
 **Notes about case sensitivity:**<br>
 * Names, emails and tags are case-sensitive. 
@@ -136,6 +137,8 @@ Format: `add n/NAME p/PHONE_NUMBER e/EMAIL [t/TAG]…​`
 
 * The phone number must follow the Singaporean convention: have 8 digits, start with 6, 8, or 9, and consist only of numbers.
 * Duplicate contacts cannot be added to the list.
+* Names are case-sensitive. For example, “Alice” and “alice” are considered distinct names.
+* Names should only contain alphanumeric characters and spaces, and it should not be blank.
 
 Examples:
 * `add n/John Doe p/98765432 e/[email protected]`
@@ -319,6 +322,8 @@ _Details coming soon ..._
 **Q**: How do I transfer my data to another Computer?<br>
 **A**: Install the app in the other computer and overwrite the empty data file it creates with the file that contains the data of your previous CampusConnect home folder.
 
+**Q**: How can I add contacts with the same name?<br>
+**A**: If two contacts share the same name, you can differentiate them by adding a number or adjusting the capitalization. For example, use “Mary” and “Mary 2” or “John” and “john” to keep each entry unique.
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 ## Known Issues