diff --git a/core/src/sagittarius/model/Arrow.java b/core/src/sagittarius/model/Arrow.java
index 8c71f26..808e75a 100644
--- a/core/src/sagittarius/model/Arrow.java
+++ b/core/src/sagittarius/model/Arrow.java
@@ -88,14 +88,14 @@ public class Arrow extends Actor {
      * Updates the physical attributes of the Arrow,
      * must be called in the main update loop.
      *
-     * @param deltaTime time elapsed between 2 frames.
+     * @param dt time elapsed between 2 frames.
      */
-    public void update(float deltaTime) {
+    public void update(float dt) {
 
         if (this.active) {
             verifyActivity();
-            integrationVerlet(deltaTime);
-            this.TTL -= deltaTime;
+            integrationVerlet(dt);
+            this.TTL -= dt;
             this.angle = this.velocity.angleDeg();
         } else {
             this.position = crash.position.cpy().add(offset);
@@ -107,20 +107,20 @@ public class Arrow extends Actor {
      * according to its physical attributes
      * using the Verlet integration scheme.
      *
-     * @param deltaTime time difference used in the integration.
+     * @param dt time difference used in the integration.
      * @see <a href="https://gamedev.stackexchange.com/a/41917">https://gamedev.stackexchange.com/a/41917</a>.
      */
-    private void integrationVerlet(float deltaTime) {
+    private void integrationVerlet(float dt) {
 
         this.acceleration = this.force.cpy();
 
-        this.position.x += deltaTime * ( this.velocity.x + deltaTime * this.acceleration.x / 2 );
-        this.position.y += deltaTime * ( this.velocity.y + deltaTime * this.acceleration.y / 2 );
+        this.position.x += dt * ( this.velocity.x + dt * this.acceleration.x / 2 );
+        this.position.y += dt * ( this.velocity.y + dt * this.acceleration.y / 2 );
 
         this.force = computeForce();
 
-        this.velocity.x += deltaTime * ( this.acceleration.x + this.force.x ) / 2;
-        this.velocity.y += deltaTime * ( this.acceleration.y + this.force.y ) / 2;
+        this.velocity.x += dt * ( this.acceleration.x + this.force.x ) / 2;
+        this.velocity.y += dt * ( this.acceleration.y + this.force.y ) / 2;
     }
 
 // ---------- GRAPHICAL METHODs ----------
diff --git a/core/src/sagittarius/model/Bow.java b/core/src/sagittarius/model/Bow.java
index 6bfa5f4..700bd5f 100644
--- a/core/src/sagittarius/model/Bow.java
+++ b/core/src/sagittarius/model/Bow.java
@@ -34,7 +34,7 @@ class Bow extends Actor {
 // ---------- METHODs ----------
     
     @Override
-    public void act(float deltaTime) {
+    public void act(float dt) {
 
         if (Gdx.input.isButtonJustPressed(Buttons.LEFT) && !pressed) {
             this.anchor = Sagittarius.worldCursor.cpy();
diff --git a/core/src/sagittarius/model/Moon.java b/core/src/sagittarius/model/Moon.java
index 3019878..51b92df 100644
--- a/core/src/sagittarius/model/Moon.java
+++ b/core/src/sagittarius/model/Moon.java
@@ -20,7 +20,7 @@ public class Moon extends Planet {
 // ---------- METHODs ----------
 
     @Override
-    public void act(float deltaTime) {
+    public void act(float dt) {
 
         this.rotateBy(10.0f / this.altitude);
 
diff --git a/core/src/sagittarius/model/Player.java b/core/src/sagittarius/model/Player.java
index 61c5267..6eb5a68 100644
--- a/core/src/sagittarius/model/Player.java
+++ b/core/src/sagittarius/model/Player.java
@@ -41,13 +41,13 @@ public class Player extends Actor {
     }
 
     @Override
-    public void act(float deltaTime) {
-        super.act(deltaTime);
+    public void act(float dt) {
+        super.act(dt);
 
         this.setX(home.getX() + this.home.getRadius()*MathUtils.cosDeg(this.getRotation()));
         this.setY(home.getY() + this.home.getRadius()*MathUtils.cosDeg(this.getRotation()));
 
-        //this.bow.act(deltaTime);
+        //this.bow.act(dt);
     }
 
     /**
diff --git a/core/src/sagittarius/view/BaseScreen.java b/core/src/sagittarius/view/BaseScreen.java
index 6f7e852..cdfd053 100644
--- a/core/src/sagittarius/view/BaseScreen.java
+++ b/core/src/sagittarius/view/BaseScreen.java
@@ -22,7 +22,7 @@ public abstract class BaseScreen implements Screen {
     @Override
     public void render(float dt) {
         
-        // update actors
+        // update Stages
         uiStage.act(dt);
         mainStage.act(dt);
         
@@ -43,8 +43,10 @@ public abstract class BaseScreen implements Screen {
         mainStage.dispose();
     }
 
-    // methods required by Screen interface
-    @Override public void resize(int width, int height) {}
+    @Override public void resize(int width, int height) {
+        mainStage.getViewport().update(width, height, true);
+    }
+
     @Override public void pause() {}
     @Override public void resume(){}
     @Override public void show() {}
diff --git a/core/src/sagittarius/view/StartScreen.java b/core/src/sagittarius/view/StartScreen.java
index 2b834fa..2b2f4e1 100644
--- a/core/src/sagittarius/view/StartScreen.java
+++ b/core/src/sagittarius/view/StartScreen.java
@@ -50,14 +50,10 @@ public class StartScreen extends BaseScreen {
     }
 
     @Override
-    public void update(float deltaTime) {
+    public void update(float dt) {
         //
     }
 
-    public void resize(int width, int height) {
-        mainStage.getViewport().update(width, height, true);
-    }
-
     @Override
     public void dispose() {
         VisUI.dispose();