diff --git a/.idea/misc.xml b/.idea/misc.xml
index a8cce1b..4e024a8 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -25,5 +25,5 @@
       </value>
     </option>
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK" />
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8 (2)" project-jdk-type="JavaSDK" />
 </project>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
index 62306f1..bee9e70 100644
--- a/.idea/modules.xml
+++ b/.idea/modules.xml
@@ -2,7 +2,7 @@
 <project version="4">
   <component name="ProjectModuleManager">
     <modules>
-      <module fileurl="file://$PROJECT_DIR$/FUPlanner.iml" filepath="$PROJECT_DIR$/FUPlanner.iml" />
+      <module fileurl="file://$PROJECT_DIR$/.idea/FUPlanner.iml" filepath="$PROJECT_DIR$/.idea/FUPlanner.iml" />
       <module fileurl="file://$PROJECT_DIR$/app/app.iml" filepath="$PROJECT_DIR$/app/app.iml" />
     </modules>
   </component>
diff --git a/.idea/vcs.xml b/.idea/vcs.xml
index 35eb1dd..8306744 100644
--- a/.idea/vcs.xml
+++ b/.idea/vcs.xml
@@ -2,5 +2,6 @@
 <project version="4">
   <component name="VcsDirectoryMappings">
     <mapping directory="" vcs="Git" />
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
   </component>
 </project>
\ No newline at end of file
diff --git a/app/src/main/java/de/sebse/fuplanner/services/KVV/KVV.java b/app/src/main/java/de/sebse/fuplanner/services/KVV/KVV.java
index 648bdcc..6b4335a 100644
--- a/app/src/main/java/de/sebse/fuplanner/services/KVV/KVV.java
+++ b/app/src/main/java/de/sebse/fuplanner/services/KVV/KVV.java
@@ -38,6 +38,10 @@ public class KVV {
 
     public void logout() {
         lastToken = null;
+        KVVModuleList modules = (KVVModuleList) addons.get("modules");
+        if (modules != null) {
+            modules.deleteModules(this.context);
+        }
         addons.clear();
     }
 
diff --git a/app/src/main/java/de/sebse/fuplanner/services/KVV/KVVModuleList.java b/app/src/main/java/de/sebse/fuplanner/services/KVV/KVVModuleList.java
index 54f1f86..741accc 100644
--- a/app/src/main/java/de/sebse/fuplanner/services/KVV/KVVModuleList.java
+++ b/app/src/main/java/de/sebse/fuplanner/services/KVV/KVVModuleList.java
@@ -8,6 +8,7 @@ import org.json.JSONArray;
 import org.json.JSONException;
 import org.json.JSONObject;
 
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.concurrent.atomic.AtomicInteger;
@@ -42,9 +43,36 @@ public class KVVModuleList extends HTTPService {
     KVVModuleList(Context context, LoginToken token) {
         super(context);
         this.token = token;
+        try {
+            this.moduleList = Modules.load(context);
+        } catch (IOException e) {
+            e.printStackTrace();
+        } catch (ClassNotFoundException e) {
+            e.printStackTrace();
+        }
     }
 
     public void getModuleList(final NetworkCallback<Modules> callback, final NetworkErrorCallback errorCallback) {
+        getModuleList(callback, errorCallback, false);
+    }
+
+    public void getModuleList(final NetworkCallback<Modules> callback, final NetworkErrorCallback errorCallback, boolean forceOverride) {
+        queueModuleDetails.add("list", () -> {
+            if (this.moduleList != null && !forceOverride) {
+                callback.onResponse(this.moduleList);
+                queueModuleDetails.next("list");
+                return;
+            }
+            this.getModuleListUpgrade(success -> {
+                this.moduleList = success;
+                callback.onResponse(this.moduleList);
+                queueModuleDetails.next("list");
+            }, errorCallback);
+        });
+    }
+
+    public void getModuleListUpgrade(final NetworkCallback<Modules> callback, final NetworkErrorCallback errorCallback) {
+        log.d("Module List refreshed");
         get("https://kvv.imp.fu-berlin.de/direct/site.json", token.getCookies(), response -> {
             String body = response.getParsed();
             if (body == null) {
@@ -82,11 +110,20 @@ public class KVVModuleList extends HTTPService {
                 errorCallback.onError(new NetworkError(101103, 403, "Cannot parse module list!"));
                 return;
             }
-            moduleList = modules;
-            callback.onResponse(moduleList);
+            callback.onResponse(modules);
         }, error -> errorCallback.onError(new NetworkError(101104, error.networkResponse.statusCode, "Cannot get module list!")));
     }
 
+    public void deleteModules(Context context) {
+        if (this.moduleList != null)
+            this.moduleList.delete(context);
+    }
+
+    public void saveModules(Context context) throws IOException {
+        if (this.moduleList != null)
+            this.moduleList.save(context);
+    }
+
     public void getModule(int index, final NetworkCallback<Modules.Module> callback, final NetworkErrorCallback errorCallback) {
         this.getModuleList(success -> callback.onResponse(success.get(index)), errorCallback);
     }
@@ -95,7 +132,12 @@ public class KVVModuleList extends HTTPService {
 
 
 
+
     public void getModuleDetails(Modules.Module module, final NetworkCallback<Modules.Module> callback, final NetworkErrorCallback errorCallback) {
+        this.getModuleDetails(module, callback, errorCallback, false);
+    }
+
+    public void getModuleDetails(Modules.Module module, final NetworkCallback<Modules.Module> callback, final NetworkErrorCallback errorCallback, boolean forceOverride) {
         AtomicInteger returns = new AtomicInteger(0);
         AtomicReference<NetworkError> lastError = new AtomicReference<>(null);
         final int items = 4;
@@ -116,10 +158,10 @@ public class KVVModuleList extends HTTPService {
             }
         };
         Runnable[] methods = { // UPDATE VARIABLE items ABOVE
-                () -> this.getAssignments(module, successCb, errorCb),
-                () -> this.getEvents(module, successCb, errorCb),
-                () -> this.getAnnouncements(module, successCb, errorCb),
-                () -> this.getGradebook(module, successCb, errorCb)
+                () -> this.getAssignments(module, successCb, errorCb, forceOverride),
+                () -> this.getEvents(module, successCb, errorCb, forceOverride),
+                () -> this.getAnnouncements(module, successCb, errorCb, forceOverride),
+                () -> this.getGradebook(module, successCb, errorCb, forceOverride)
         };
         //noinspection ConstantConditions
         if (methods.length != items) throw new AssertionError();
@@ -131,11 +173,13 @@ public class KVVModuleList extends HTTPService {
 
 
 
-
-
     public void getAnnouncements(Modules.Module module, final NetworkCallback<Modules.Module> callback, final NetworkErrorCallback errorCallback) {
+        getAnnouncements(module, callback, errorCallback, false);
+    }
+
+    public void getAnnouncements(Modules.Module module, final NetworkCallback<Modules.Module> callback, final NetworkErrorCallback errorCallback, boolean forceOverride) {
         queueModuleDetails.add(module.getID(), () -> {
-            if (module.announcements != null) {
+            if (module.announcements != null && !forceOverride) {
                 callback.onResponse(module);
                 queueModuleDetails.next(module.getID());
                 return;
@@ -183,12 +227,13 @@ public class KVVModuleList extends HTTPService {
 
 
 
-
-
     public void getAssignments(Modules.Module module, final NetworkCallback<Modules.Module> callback, final NetworkErrorCallback errorCallback) {
-        //log.d("In getAssignments");
+        getAssignments(module, callback, errorCallback, false);
+    }
+
+    public void getAssignments(Modules.Module module, final NetworkCallback<Modules.Module> callback, final NetworkErrorCallback errorCallback, boolean forceOverride) {
         queueModuleDetails.add(module.getID(), () -> {
-            if (module.assignments != null) {
+            if (module.assignments != null && !forceOverride) {
                 callback.onResponse(module);
                 queueModuleDetails.next(module.getID());
                 return;
@@ -250,10 +295,13 @@ public class KVVModuleList extends HTTPService {
 
 
 
-
     public void getEvents(Modules.Module module, final NetworkCallback<Modules.Module> callback, final NetworkErrorCallback errorCallback) {
+        getEvents(module, callback, errorCallback, false);
+    }
+
+    public void getEvents(Modules.Module module, final NetworkCallback<Modules.Module> callback, final NetworkErrorCallback errorCallback, boolean forceOverride) {
         queueModuleDetails.add(module.getID(), () -> {
-            if (module.events != null) {
+            if (module.events != null && !forceOverride) {
                 callback.onResponse(module);
                 queueModuleDetails.next(module.getID());
                 return;
@@ -300,10 +348,15 @@ public class KVVModuleList extends HTTPService {
 
 
 
+
+
     public void getGradebook(Modules.Module module, final NetworkCallback<Modules.Module> callback, final NetworkErrorCallback errorCallback) {
-        //log.d("In getAssignments");
+        getGradebook(module, callback, errorCallback, false);
+    }
+
+    public void getGradebook(Modules.Module module, final NetworkCallback<Modules.Module> callback, final NetworkErrorCallback errorCallback, boolean forceOverride) {
         queueModuleDetails.add(module.getID(), () -> {
-            if (module.gradebook != null) {
+            if (module.gradebook != null && !forceOverride) {
                 callback.onResponse(module);
                 queueModuleDetails.next(module.getID());
                 return;
diff --git a/app/src/main/java/de/sebse/fuplanner/services/KVV/types/Modules.java b/app/src/main/java/de/sebse/fuplanner/services/KVV/types/Modules.java
index 74cdf42..afba01f 100644
--- a/app/src/main/java/de/sebse/fuplanner/services/KVV/types/Modules.java
+++ b/app/src/main/java/de/sebse/fuplanner/services/KVV/types/Modules.java
@@ -1,8 +1,16 @@
 package de.sebse.fuplanner.services.KVV.types;
 
+import android.content.Context;
 import android.support.annotation.NonNull;
 import android.support.v7.util.SortedList;
 
+import java.io.FileInputStream;
+import java.io.FileNotFoundException;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.HashSet;
 import java.util.Iterator;
@@ -16,10 +24,11 @@ import de.sebse.fuplanner.tools.logging.Logger;
  * Created by sebastian on 29.10.17.
  */
 
-public class Modules /*extends EventEmitter<Triplet<Integer, Modules.UpgradeModule, ArrayList<String>>>*/ implements Iterable<Modules.Module> {
+public class Modules /*extends EventEmitter<Triplet<Integer, Modules.UpgradeModule, ArrayList<String>>>*/ implements Iterable<Modules.Module>, Serializable {
     private final SortedList<Module> list;
     private String latestSemester = null;
     private Logger log = new Logger(this);
+    private static final String FILE_NAME = "ModuleListSaving";
 
     public Modules() {
         this.list = new SortedList<>(Module.class, new SortedList.Callback<Module>() {
@@ -183,6 +192,27 @@ public class Modules /*extends EventEmitter<Triplet<Integer, Modules.UpgradeModu
         return this.list.get(index);
     }
 
+    public static Modules load(Context context) throws IOException, ClassNotFoundException {
+        FileInputStream fis = context.openFileInput(FILE_NAME);
+        ObjectInputStream is = new ObjectInputStream(fis);
+        Modules modules = (Modules) is.readObject();
+        is.close();
+        fis.close();
+        return modules;
+    }
+
+    public void save(Context context) throws IOException {
+        FileOutputStream fos = context.openFileOutput(FILE_NAME, Context.MODE_PRIVATE);
+        ObjectOutputStream os = new ObjectOutputStream(fos);
+        os.writeObject(this);
+        os.close();
+        fos.close();
+    }
+
+    public void delete(Context context) {
+        context.deleteFile(FILE_NAME);
+    }
+
     public class Module {
         public final String semester;
         public final HashSet<String> lvNumber;
diff --git a/app/src/main/java/de/sebse/fuplanner/tools/EventList.java b/app/src/main/java/de/sebse/fuplanner/tools/EventList.java
index 239b509..c233f0a 100644
--- a/app/src/main/java/de/sebse/fuplanner/tools/EventList.java
+++ b/app/src/main/java/de/sebse/fuplanner/tools/EventList.java
@@ -6,11 +6,10 @@ import java.util.Collections;
 import java.util.Iterator;
 
 import de.sebse.fuplanner.services.KVV.types.Event;
-import de.sebse.fuplanner.tools.logging.Logger;
 
 public class EventList extends ArrayList<Event> {
     private int split = 0;
-    private Logger log = new Logger(this);
+
     public Event getPast(int index) {
         if (split < 0)
             sort();
@@ -79,10 +78,8 @@ public class EventList extends ArrayList<Event> {
             @Override
             public Event next() {
                 if (hasNext()) {
-                    log.d("Event hasnext", hasNext());
                     return EventList.this.get(i[0]++);
                 } else {
-                    log.d("Event null", hasNext());
                     return null;
                 }
             }