diff --git a/.gitignore b/.gitignore
index c25f212..47af25b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,5 +22,8 @@
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
 
+# Ignore Gradle project-specific cache directory
 .gradle
-.idea
+
+# Ignore Gradle build output directory
+build
diff --git a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Game.java b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Game.java
new file mode 100644
index 0000000..bab3390
--- /dev/null
+++ b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Game.java
@@ -0,0 +1,47 @@
+package ch.zhaw.projekt2.turnierverwaltung;
+
+public class Game {
+    private Participant participant1, Participant2;
+    private int points1, points2;
+    private Location location;
+
+    public Location getLocation() {
+        return location;
+    }
+
+    public void setLocation(Location location) {
+        this.location = location;
+    }
+
+    public int getPoints1() {
+        return points1;
+    }
+
+    public void setPoints1(int points1) {
+        this.points1 = points1;
+    }
+
+    public int getPoints2() {
+        return points2;
+    }
+
+    public void setPoints2(int points2) {
+        this.points2 = points2;
+    }
+
+    public Participant getParticipant1() {
+        return participant1;
+    }
+
+    public void setParticipant1(Participant participant1) {
+        this.participant1 = participant1;
+    }
+
+    public Participant getParticipant2() {
+        return Participant2;
+    }
+
+    public void setParticipant2(Participant participant2) {
+        Participant2 = participant2;
+    }
+}
diff --git a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Location.java b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Location.java
new file mode 100644
index 0000000..448ae67
--- /dev/null
+++ b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Location.java
@@ -0,0 +1,17 @@
+package ch.zhaw.projekt2.turnierverwaltung;
+
+public class Location {
+    private String name;
+
+    public Location(String name){
+        setName(name);
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}
diff --git a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Participant.java b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Participant.java
new file mode 100644
index 0000000..e48f3a1
--- /dev/null
+++ b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Participant.java
@@ -0,0 +1,6 @@
+package ch.zhaw.projekt2.turnierverwaltung;
+
+public interface Participant {
+    String getName();
+    void setName(String name);
+}
diff --git a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Person.java b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Person.java
new file mode 100644
index 0000000..1165e7d
--- /dev/null
+++ b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Person.java
@@ -0,0 +1,37 @@
+package ch.zhaw.projekt2.turnierverwaltung;
+
+public class Person {
+    private String name;
+    private String firstName;
+    private String phoneNumber;
+
+    public Person(String firstName, String name, String phoneNumber){
+        setFirstName(firstName);
+        setName(name);
+        setPhoneNumber(phoneNumber);
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public void setFirstName(String firstName) {
+        this.firstName = firstName;
+    }
+
+    public String getPhoneNumber() {
+        return phoneNumber;
+    }
+
+    public void setPhoneNumber(String phoneNumber) {
+        this.phoneNumber = phoneNumber;
+    }
+}
diff --git a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Player.java b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Player.java
new file mode 100644
index 0000000..4273fd1
--- /dev/null
+++ b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Player.java
@@ -0,0 +1,21 @@
+package ch.zhaw.projekt2.turnierverwaltung;
+
+import java.util.Date;
+
+public class Player extends Person implements Participant{
+
+    private Date dateOfBirth;
+
+    public Player(String firstName, String name, String phoneNumber, Date dateOfBirth){
+        super(firstName, name, phoneNumber);
+        setDateOfBirth(dateOfBirth);
+    }
+
+    public Date getDateOfBirth() {
+        return dateOfBirth;
+    }
+
+    public void setDateOfBirth(Date dateOfBirth) {
+        this.dateOfBirth = dateOfBirth;
+    }
+}
diff --git a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Team.java b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Team.java
new file mode 100644
index 0000000..880cc13
--- /dev/null
+++ b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Team.java
@@ -0,0 +1,37 @@
+package ch.zhaw.projekt2.turnierverwaltung;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class Team implements Participant {
+    private String name;
+    private List<Player> players;
+    private Person contactPerson;
+
+    public Team(String name){
+        setName(name);
+        players = new ArrayList<>();
+    }
+
+    public void addPlayer(Player player){
+        players.add(player);
+    }
+
+    @Override
+    public String getName() {
+        return name;
+    }
+
+    @Override
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public Person getContactPerson() {
+        return contactPerson;
+    }
+
+    public void setContactPerson(Person contactPerson) {
+        this.contactPerson = contactPerson;
+    }
+}
diff --git a/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Tournament.java b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Tournament.java
new file mode 100644
index 0000000..5845a12
--- /dev/null
+++ b/app/src/main/java/ch/zhaw/projekt2/turnierverwaltung/Tournament.java
@@ -0,0 +1,17 @@
+package ch.zhaw.projekt2.turnierverwaltung;
+
+public class Tournament {
+    private String name;
+
+    public Tournament(String name){
+        setName(name);
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+}