diff --git a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Participant.java b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Participant.java
index 844f941..cf0ccf5 100644
--- a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Participant.java
+++ b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Participant.java
@@ -4,7 +4,7 @@ import java.io.Serializable;
 
 public interface Participant extends Serializable {
     String getName();
-    void setName(String name);
+    void setName(String name) throws InvalidNameException;
     boolean equals(Participant participant);
     void change(Participant participant) throws Person.InvalidPhoneNumberException;
 }
diff --git a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Player.java b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Player.java
index 69da1a0..2637ee9 100644
--- a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Player.java
+++ b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Player.java
@@ -71,9 +71,9 @@ public class Player extends Person implements Participant {
      */
     public void setDateOfBirth(String dateOfBirth) throws InvalidDateException {
         logger.finer("Trying to set of birth with the String " + dateOfBirth + " provided");
-        if(dateOfBirth.length() > 0) {
+        if (dateOfBirth.length() > 0) {
             String[] date = dateOfBirth.split("\\.");
-            try{
+            try {
                 this.dateOfBirth = LocalDate.of(Integer.valueOf(date[2]), Integer.valueOf(date[1]), Integer.valueOf(date[0]));
                 logger.fine("Date of birth of" + getName() + " has been set to " + dateOfBirth);
             } catch (NumberFormatException | IndexOutOfBoundsException e) {
@@ -99,7 +99,7 @@ public class Player extends Person implements Participant {
     /**
      * Override of equals method to compare participants against each other
      *
-     * @param participant
+     * @param participant to be compared with this instance
      * @return true if equals, false if not
      */
     @Override
@@ -114,7 +114,7 @@ public class Player extends Person implements Participant {
      * @param participant the new participant to be added
      */
     @Override
-    public void change(Participant participant) {
+    public void change(Participant participant) throws InvalidPhoneNumberException {
         logger.fine("changing the current Player " + this + "with " + participant.getName());
         Player player = (Player) participant;
 
diff --git a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Tournament.java b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Tournament.java
index 276f201..9c8c47a 100644
--- a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Tournament.java
+++ b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Tournament.java
@@ -59,7 +59,7 @@ public class Tournament implements Serializable {
      *
      * @param newParticipant the Participant to be saved or edited
      */
-    public void saveParticipant(Participant newParticipant) {
+    public void saveParticipant(Participant newParticipant) throws Person.InvalidPhoneNumberException {
         logger.fine("Trying to add " + newParticipant + " into the tournament");
         for (Participant participant : participants) {
             if (participant.equals(newParticipant)) {