diff --git a/src/main/java/ch/zhaw/pm2/racetrack/Track.java b/src/main/java/ch/zhaw/pm2/racetrack/Track.java
index f0f6fdb..bac8f92 100644
--- a/src/main/java/ch/zhaw/pm2/racetrack/Track.java
+++ b/src/main/java/ch/zhaw/pm2/racetrack/Track.java
@@ -47,7 +47,7 @@ import java.util.Scanner;
  *
  * <p>All lines must have the same length, used to initialize the grid width).
  * Beginning empty lines are skipped.
- * The the tracks ends with the first empty line or the file end.<br>
+ * The tracks ends with the first empty line or the file end.<br>
  * An {@link InvalidTrackFormatException} is thrown, if
  * <ul>
  *   <li>not all track lines have the same length</li>
@@ -67,7 +67,8 @@ public class Track implements TrackSpecification {
 
     /**
      * Initializes the Track from the given track File including the cars.
-     * Throws an corresponding error if one of the conditions are not met to build a track.
+     * Throws a corresponding error if one of the conditions are not met to build a track.
+     *
      * @param trackFile Reference to a file containing the track data
      * @throws FileNotFoundException       if the given track file could not be found
      * @throws InvalidTrackFormatException if the track file contains invalid data (no tracklines, ...)
@@ -95,7 +96,7 @@ public class Track implements TrackSpecification {
     }
 
     /**
-     * Goes through the track ArrayList and determines the locations of each cars and initializes them at the location.
+     * Goes through the track ArrayList and determines the locations of each car and initializes them at the location.
      *
      * @throws InvalidTrackFormatException is thrown if a car is found more than once inside the track.
      */
@@ -377,11 +378,11 @@ public class Track implements TrackSpecification {
         int x = startPosition.getX();
         int y = startPosition.getY();
 
-        // Relative Distance (x & y axis) between end- and starting position
+        // Relative Distance (x & y-axis) between end- and starting position
         int diffX = endPosition.getX() - startPosition.getX();
         int diffY = endPosition.getY() - startPosition.getY();
 
-        // Absolute distance (x & y axis) between end- and starting position
+        // Absolute distance (x & y-axis) between end- and starting position
         int distX = Math.abs(diffX);
         int distY = Math.abs(diffY);
 
@@ -394,7 +395,7 @@ public class Track implements TrackSpecification {
         int diagonalStepX, diagonalStepY;
         int distanceSlowAxis, distanceFastAxis;
         if (distX > distY) {
-            // x axis is the 'fast' direction
+            // x-axis is the 'fast' direction
             parallelStepX = dirX;
             parallelStepY = 0; // parallel step only moves in x direction
             diagonalStepX = dirX;
@@ -402,7 +403,7 @@ public class Track implements TrackSpecification {
             distanceSlowAxis = distY;
             distanceFastAxis = distX;
         } else {
-            // y axis is the 'fast' direction
+            // y-axis is the 'fast' direction
             parallelStepX = 0;
             parallelStepY = dirY; // parallel step only moves in y direction
             diagonalStepX = dirX;
@@ -431,12 +432,13 @@ public class Track implements TrackSpecification {
     }
 
     /**
-     * This method will check if a car is passing the finishline.
-     * If the car is passing the finishline in the wrong direction, the car will lose a winpoint.
-     * If the car is passing the finishline in the correct direction, the car will gain a winpoint.
-     * @param start the startposition of the car
-     * @param finish the expected finishpositon of the car after the move
-     * @return Number of new Winpoints for the current player.
+     * This method will check if a car is passing the finish line.
+     * If the car is passing the finish line in the wrong direction, the car will lose a winpoint.
+     * If the car is passing the finish line in the correct direction, the car will gain a winpoint.
+     *
+     * @param start the start position of the car
+     * @param finish the expected finish position of the car after the move
+     * @return Number of new winpoints for the current player.
      */
     public int calculateNewWinPoints(PositionVector start, PositionVector finish) {
         List<PositionVector> path = calculatePointsOnPath(start, finish);
diff --git a/src/main/java/ch/zhaw/pm2/racetrack/strategy/PathFinderMoveStrategy.java b/src/main/java/ch/zhaw/pm2/racetrack/strategy/PathFinderMoveStrategy.java
index 178775c..1442e76 100644
--- a/src/main/java/ch/zhaw/pm2/racetrack/strategy/PathFinderMoveStrategy.java
+++ b/src/main/java/ch/zhaw/pm2/racetrack/strategy/PathFinderMoveStrategy.java
@@ -98,8 +98,8 @@ public class PathFinderMoveStrategy implements MoveStrategy{
      * Combination of position and velocity
      */
     public static class State{
-        PositionVector position;
-        PositionVector velocity;
+        final PositionVector position;
+        final PositionVector velocity;
 
         /**
          * Constructor of State
@@ -126,13 +126,13 @@ public class PathFinderMoveStrategy implements MoveStrategy{
      */
     public class PossibleMove {
         // List of all directions used for the previous moves and the direction of the current move (the highest Index).
-        List<PositionVector.Direction> directions;
+        final List<PositionVector.Direction> directions;
         // Position of the car bevor the move is executed
-        PositionVector startPosition;
+        final PositionVector startPosition;
         // Position of the car after the move is executed
-        PositionVector endPosition;
+        final PositionVector endPosition;
         // Velocity of the car after the move is executed
-        PositionVector endVelocity;
+        final PositionVector endVelocity;
 
         /**
          * Constructor of PossibleMove
diff --git a/src/main/java/ch/zhaw/pm2/racetrack/strategy/UserMoveStrategy.java b/src/main/java/ch/zhaw/pm2/racetrack/strategy/UserMoveStrategy.java
index a75b4fb..6b6ce40 100644
--- a/src/main/java/ch/zhaw/pm2/racetrack/strategy/UserMoveStrategy.java
+++ b/src/main/java/ch/zhaw/pm2/racetrack/strategy/UserMoveStrategy.java
@@ -5,7 +5,7 @@ import ch.zhaw.pm2.racetrack.UserInterface;
 
 /**
  * Let the user decide the next move.
- * Therefore it uses the UserInterface class to ask for a direction.
+ * Therefore, it uses the UserInterface class to ask for a direction.
  */
 public class UserMoveStrategy implements MoveStrategy {
     private final UserInterface userInterface;
@@ -18,6 +18,11 @@ public class UserMoveStrategy implements MoveStrategy {
         this.carID = carID;
     }
 
+    /**
+     * Uses the interface to determine which move the user takes.
+     *
+     * @return the next taken move as Direction
+     */
     @Override
     public Direction nextMove() {
         return userInterface.selectDirection(carIndex, carID);
diff --git a/src/test/java/ch/zhaw/pm2/racetrack/GameTest.java b/src/test/java/ch/zhaw/pm2/racetrack/GameTest.java
index d0f1639..a80644e 100644
--- a/src/test/java/ch/zhaw/pm2/racetrack/GameTest.java
+++ b/src/test/java/ch/zhaw/pm2/racetrack/GameTest.java
@@ -202,13 +202,13 @@ class GameTest {
     }
 
     /**
-     * This Class is used to communicate with the UserInterface. It overrides crucial methods and returns an instruction based on the instructions data field.
+     * This Class is used to communicate with the UserInterface. It overrides crucial methods and returns an instruction based on the instructions' data field.
      * To implement the right instructions the user has to be aware of the game sequence.
      */
     private class interFace extends UserInterface {
 
-        private PositionVector.Direction[] directions;
-        private Integer[] instructions;
+        private final PositionVector.Direction[] directions;
+        private final Integer[] instructions;
         private int pointerDir,pointerInstruction;