diff --git a/app/src/main/java/evaluating/History.java b/app/src/main/java/evaluating/History.java
new file mode 100644
index 0000000..6a7bf8a
--- /dev/null
+++ b/app/src/main/java/evaluating/History.java
@@ -0,0 +1,9 @@
+package evaluating;
+
+/**
+ * Created by jonas on 05/05/2015.
+ * Not to be read or used by anyone but jonas.
+ */
+public interface History {
+
+}
diff --git a/app/src/main/java/planning/Exercise.java b/app/src/main/java/planning/Exercise.java
new file mode 100644
index 0000000..0415db8
--- /dev/null
+++ b/app/src/main/java/planning/Exercise.java
@@ -0,0 +1,10 @@
+package planning;
+
+/**
+ * Created by jonas on 05/05/2015.
+ * Not to be read or used by anyone but jonas.
+ */
+public interface Exercise {
+    String getName();
+    void setName(String name);
+}
diff --git a/app/src/main/java/planning/Plan.java b/app/src/main/java/planning/Plan.java
new file mode 100644
index 0000000..93575fc
--- /dev/null
+++ b/app/src/main/java/planning/Plan.java
@@ -0,0 +1,14 @@
+package planning;
+
+import java.util.ArrayList;
+
+/**
+ * Created by jonas on 05/05/2015.
+ * Not to be read or used by anyone but jonas.
+ */
+public interface Plan {
+    ArrayList<Exercise> getExercises();
+    void setExercises(ArrayList<Exercise> exercises);
+    void addExercise(Exercise exercise);
+    void removeExercise(Exercise exercise);
+}
diff --git a/app/src/main/java/planning/PlanStore.java b/app/src/main/java/planning/PlanStore.java
new file mode 100644
index 0000000..8e50165
--- /dev/null
+++ b/app/src/main/java/planning/PlanStore.java
@@ -0,0 +1,9 @@
+package planning;
+
+/**
+ * Created by jonas on 06/05/2015.
+ * Not to be read or used by anyone but jonas.
+ */
+public interface PlanStore {
+
+}
diff --git a/app/src/main/java/training/Fit.java b/app/src/main/java/training/Fit.java
new file mode 100644
index 0000000..45f1898
--- /dev/null
+++ b/app/src/main/java/training/Fit.java
@@ -0,0 +1,17 @@
+package training;
+
+import java.util.ArrayList;
+
+import planning.Plan;
+
+/**
+ * Created by jonas on 05/05/2015.
+ * Not to be read or used by anyone but jonas.
+ */
+public interface Fit {
+    // Setter und Getter für alle Fitnesspläne
+    public ArrayList<Plan> getPlans();
+    public void setPlans(ArrayList<Plan> plans);
+    void addPlan(Plan plan);
+    void removePlan(Plan plan);
+}
diff --git a/app/src/main/java/training/Record.java b/app/src/main/java/training/Record.java
new file mode 100644
index 0000000..b846039
--- /dev/null
+++ b/app/src/main/java/training/Record.java
@@ -0,0 +1,12 @@
+package training;
+
+/**
+ * Created by jonas on 05/05/2015.
+ * Not to be read or used by anyone but jonas.
+ */
+public interface Record {
+    int getWeight();
+    void setWeight(int weight);
+    int getRepetitions();
+    void setRepetitions(int repetitions);
+}
diff --git a/app/src/main/java/training/Training.java b/app/src/main/java/training/Training.java
new file mode 100644
index 0000000..b9f62e9
--- /dev/null
+++ b/app/src/main/java/training/Training.java
@@ -0,0 +1,18 @@
+package training;
+
+import java.util.ArrayList;
+import java.util.Date;
+
+import planning.Exercise;
+
+/**
+ * Created by jonas on 05/05/2015.
+ * Not to be read or used by anyone but jonas.
+ */
+public interface Training {
+    ArrayList<Exercise> getExercises();
+    void setExercises(ArrayList<Exercise> exercises);
+
+    Date getDay();
+    void setDay(Date date);
+}
\ No newline at end of file
diff --git a/app/src/main/java/user/User.java b/app/src/main/java/user/User.java
new file mode 100644
index 0000000..a049193
--- /dev/null
+++ b/app/src/main/java/user/User.java
@@ -0,0 +1,9 @@
+package user;
+
+/**
+ * Created by jonas on 06/05/2015.
+ * Not to be read or used by anyone but jonas.
+ */
+public interface User {
+
+}
\ No newline at end of file