diff --git a/code/PrimeChecker/src/main/java/ch/zhaw/prog2/primechecker/PrimeChecker.java b/code/PrimeChecker/src/main/java/ch/zhaw/prog2/primechecker/PrimeChecker.java
index 76e6e42..9036ecf 100644
--- a/code/PrimeChecker/src/main/java/ch/zhaw/prog2/primechecker/PrimeChecker.java
+++ b/code/PrimeChecker/src/main/java/ch/zhaw/prog2/primechecker/PrimeChecker.java
@@ -21,7 +21,7 @@ public class PrimeChecker {
 
     private static void checkPrimes(int numPrimes) throws InterruptedException {
         for (int i = 0; i < numPrimes; i++) {
-            new PrimeTask(nextRandom()).run(); // runs sequential in current thread
+            new Thread(new PrimeTask(nextRandom())).start(); // runs sequential in current thread
         }
     }
 
diff --git a/code/PrimeChecker/src/main/java/ch/zhaw/prog2/primechecker/PrimeCheckerExecutor.java b/code/PrimeChecker/src/main/java/ch/zhaw/prog2/primechecker/PrimeCheckerExecutor.java
index aa390c4..423d0c2 100644
--- a/code/PrimeChecker/src/main/java/ch/zhaw/prog2/primechecker/PrimeCheckerExecutor.java
+++ b/code/PrimeChecker/src/main/java/ch/zhaw/prog2/primechecker/PrimeCheckerExecutor.java
@@ -2,6 +2,7 @@ package ch.zhaw.prog2.primechecker;
 
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
 
 public class PrimeCheckerExecutor {
@@ -25,15 +26,16 @@ public class PrimeCheckerExecutor {
 
     private static void checkPrimes(int numPrimes) throws InterruptedException {
         // TODO: create ExecutorService - What ThreadPool-Type/-Size fits best?
-
+        ExecutorService executor = Executors.newFixedThreadPool(12);
         for (int i = 0; i < numPrimes; i++) {
             // TODO: execute the runnable using the executor service
 
+            executor.execute(new PrimeTask(nextRandom()));
         }
-        // stop ExecutorService
-
-        // wait for termination with timeout of 1 minute
-
+        // TODO: stop ExecutorService
+        executor.shutdown();
+        // TODO: wait for termination with timeout of 1 minute
+        executor.awaitTermination(1, TimeUnit.MINUTES);
     }
 
     private static long nextRandom() {
diff --git a/code/PrimeChecker/src/main/java/ch/zhaw/prog2/primechecker/PrimeCheckerFuture.java b/code/PrimeChecker/src/main/java/ch/zhaw/prog2/primechecker/PrimeCheckerFuture.java
index a871611..53b24b3 100644
--- a/code/PrimeChecker/src/main/java/ch/zhaw/prog2/primechecker/PrimeCheckerFuture.java
+++ b/code/PrimeChecker/src/main/java/ch/zhaw/prog2/primechecker/PrimeCheckerFuture.java
@@ -25,19 +25,26 @@ public class PrimeCheckerFuture {
 
     private static void checkPrimes(int numPrimes) throws InterruptedException {
         // TODO: create ExecutorService
-
+        ExecutorService executor = Executors.newFixedThreadPool(12);
 
         // TODO: submit tasks to ExecutorService and collect the returned Futures in a List
+        List<Future<PrimeTaskCallable.Result>> futures = new ArrayList<>();
         for (int i = 0; i < numPrimes; i++) {
-
+            futures.add(executor.submit(new PrimeTaskCallable(nextRandom())));
         }
         // TODO: Loop through List, wait for completion and print results
-
+        for(Future<PrimeTaskCallable.Result> future : futures){
+            try {
+                System.out.println(future.get());
+            } catch (ExecutionException e) {
+                e.printStackTrace();
+            }
+        }
 
         // TODO: stop ExecutorService
-
+        executor.shutdown();
         // TODO: await termination with timeout 1 minute
-
+        executor.awaitTermination(1, TimeUnit.MINUTES);
     }
 
     private static long nextRandom() {
diff --git a/code/PrimeChecker/src/main/java/ch/zhaw/prog2/primechecker/PrimeTaskCallable.java b/code/PrimeChecker/src/main/java/ch/zhaw/prog2/primechecker/PrimeTaskCallable.java
index e29f293..a4a7f51 100644
--- a/code/PrimeChecker/src/main/java/ch/zhaw/prog2/primechecker/PrimeTaskCallable.java
+++ b/code/PrimeChecker/src/main/java/ch/zhaw/prog2/primechecker/PrimeTaskCallable.java
@@ -12,7 +12,7 @@ public class PrimeTaskCallable implements Callable<PrimeTaskCallable.Result> {
 
 
     public Result call() {
-        return null;
+        return new Result(primeCandidate, findSmallestFactor(primeCandidate));
     }
 
     /**
@@ -47,5 +47,14 @@ public class PrimeTaskCallable implements Callable<PrimeTaskCallable.Result> {
             this.factor = factor;
             this.isPrime = factor == 0;
         }
+
+        @Override
+        public String toString() {
+            return "Result{" +
+                "candidate=" + candidate +
+                ", factor=" + factor +
+                ", isPrime=" + isPrime +
+                '}';
+        }
     }
 }