diff --git a/README.md b/README.md
index 3ca0d75..ab8b62a 100644
--- a/README.md
+++ b/README.md
@@ -18,6 +18,7 @@ Basically, it does only provide only the two calls `getState` and `executeAction
 * `sbt scalastyle` to make a check with ScalaStyle.
 * `sbt doc` to generate the scaladoc API documentation.
 * `sbt scalafmt` to format the Scala source files with scalafmt.
+* `sbt release with-defaults` to create a release with a new version number which is published to a repository.
 
 ## NFA for the Representation of Tests
 A nondeterministic finite automaton represents the states of the GUI during the test.
diff --git a/build.sbt b/build.sbt
index ed152cb..6117e06 100644
--- a/build.sbt
+++ b/build.sbt
@@ -30,7 +30,7 @@ mainClass in (Compile, run) := Some("de.retest.guistatemachine.rest.WebServer")
 mainClass in (Compile, packageBin) := Some("de.retest.guistatemachine.rest.WebServer")
 
 publishTo := {
-  val nexus = "https://my.artifact.repo.net/"
+  val nexus = "https://oss.sonatype.org/"
   if (isSnapshot.value)
     Some("snapshots" at nexus + "content/repositories/snapshots")
   else
diff --git a/src/main/scala/de/retest/guistatemachine/api/Action.scala b/src/main/scala/de/retest/guistatemachine/api/Action.scala
index aa77304..e3432e4 100644
--- a/src/main/scala/de/retest/guistatemachine/api/Action.scala
+++ b/src/main/scala/de/retest/guistatemachine/api/Action.scala
@@ -2,7 +2,7 @@ package de.retest.guistatemachine.api
 
 /**
   * Interaction from the user with the GUI.
-  * TODO #6 Use an abstract representation of actions from retest-model instead of Selenium.
+  * TODO #6 Use an abstract representation of actions from retest-model instead of Selenium. The legacy code used `ActionIdentifyingAttributes`.
   */
 case class Action(a: org.openqa.selenium.interactions.Action) {
 
diff --git a/src/main/scala/de/retest/guistatemachine/api/GuiStateMachine.scala b/src/main/scala/de/retest/guistatemachine/api/GuiStateMachine.scala
index 7517580..145f8a8 100644
--- a/src/main/scala/de/retest/guistatemachine/api/GuiStateMachine.scala
+++ b/src/main/scala/de/retest/guistatemachine/api/GuiStateMachine.scala
@@ -26,4 +26,16 @@ trait GuiStateMachine {
     * @return The current state which the transition of a leads to.
     */
   def executeAction(from: State, a: Action, descriptors: Descriptors, neverExploredActions: Set[Action]): State
+
+  /**
+    * Can be used by the GA to generate new test cases.
+    * @return All actions which have not been explored yet.
+    */
+  def getAllNeverExploredActions: scala.collection.mutable.Set[Action]
+
+  /**
+    * In the legacy code this was only used to show the number of actions which have been explored by Monkey Testing.
+    * @return All actions which have been explored and therefore have a corresponding transition.
+    */
+  def getAllExploredActions: scala.collection.mutable.Set[Action]
 }
\ No newline at end of file
diff --git a/src/main/scala/de/retest/guistatemachine/api/State.scala b/src/main/scala/de/retest/guistatemachine/api/State.scala
index b82047c..3c379e8 100644
--- a/src/main/scala/de/retest/guistatemachine/api/State.scala
+++ b/src/main/scala/de/retest/guistatemachine/api/State.scala
@@ -1,5 +1,7 @@
 package de.retest.guistatemachine.api
 
+import scala.util.Random
+
 /**
   * A state should be identified by its corresponding [[Descriptors]].
   * It consists of actions which have not been explored yet and transitions to states which build up the state machine.
@@ -23,6 +25,18 @@ trait State {
     */
   def getTransitions: Map[Action, Set[State]]
 
+  /**
+    * This was used in the legacy code for Monkey testing.
+    * @return Returns a random action or an empty value if there are none left.
+    */
+  def getRandomAction(): Option[Action] = {
+    val r = getAllActions.toVector
+    if (r.isEmpty) { None } else {
+      val rnd = new Random()
+      Some(r(rnd.nextInt(r.size)))
+    }
+  }
+
   /**
     * Adds a new transition to the state which is only allowed by calling the methods of [[GuiStateMachine]].
     * @param a The action which represents the transition's consumed symbol.
@@ -30,6 +44,12 @@ trait State {
     */
   private[api] def addTransition(a: Action, to: State): Unit
 
+  /**
+    * This was named `getRandomActions` in the legacy code but actually returned all actions.
+    * @return All actions (explored + unexplored).
+    */
+  private def getAllActions(): Set[Action] = getNeverExploredActions ++ getTransitions.keySet
+
   /**
     * Overriding this method is required to allow the usage of a set of states.
     * Comparing the descriptors should check for the equality of all root elements which compares the identifying attributes and the contained components
@@ -47,4 +67,4 @@ trait State {
   override def hashCode(): Int = this.getDescriptors.hashCode()
 
   override def toString: String = s"descriptors=${getDescriptors},neverExploredActions=${getNeverExploredActions},transitions=${getTransitions}"
-}
+}
\ No newline at end of file
diff --git a/src/main/scala/de/retest/guistatemachine/api/impl/GuiStateMachineImpl.scala b/src/main/scala/de/retest/guistatemachine/api/impl/GuiStateMachineImpl.scala
index 61e7235..f852863 100644
--- a/src/main/scala/de/retest/guistatemachine/api/impl/GuiStateMachineImpl.scala
+++ b/src/main/scala/de/retest/guistatemachine/api/impl/GuiStateMachineImpl.scala
@@ -3,14 +3,27 @@ package de.retest.guistatemachine.api.impl
 import de.retest.guistatemachine.api.{Action, Descriptors, GuiStateMachine, State}
 
 import scala.collection.mutable.HashMap
+import scala.collection.mutable.HashSet
 
 class GuiStateMachineImpl extends GuiStateMachine {
   val states = new HashMap[Descriptors, State]
 
+  /**
+    * In the legacy code we had `getAllNeverExploredActions` which had to collect them from all states and make sure they were never executed.
+    * Storing them directly in a set improves efficiency.
+    */
+  val allNeverExploredActions = new HashSet[Action]
+
+  /**
+    * The legacy code stored execution counters for every action.
+    */
+  val allExploredActions = new HashSet[Action]
+
   override def getState(descriptors: Descriptors, neverExploredActions: Set[Action]): State = {
     if (states.contains(descriptors)) {
       states(descriptors)
     } else {
+      allNeverExploredActions ++= (neverExploredActions -- allExploredActions)
       val s = new StateImpl(descriptors, neverExploredActions)
       states += (descriptors -> s)
       s
@@ -19,7 +32,13 @@ class GuiStateMachineImpl extends GuiStateMachine {
 
   override def executeAction(from: State, a: Action, descriptors: Descriptors, neverExploredActions: Set[Action]): State = {
     val to = getState(descriptors, neverExploredActions)
+    allExploredActions += a
+    allNeverExploredActions -= a
     from.addTransition(a, to)
     to
   }
+
+  override def getAllNeverExploredActions: scala.collection.mutable.Set[Action] = allNeverExploredActions
+
+  override def getAllExploredActions: scala.collection.mutable.Set[Action] = allExploredActions
 }
\ No newline at end of file
diff --git a/src/main/scala/de/retest/guistatemachine/api/impl/StateImpl.scala b/src/main/scala/de/retest/guistatemachine/api/impl/StateImpl.scala
index 711c132..aed3817 100644
--- a/src/main/scala/de/retest/guistatemachine/api/impl/StateImpl.scala
+++ b/src/main/scala/de/retest/guistatemachine/api/impl/StateImpl.scala
@@ -25,4 +25,4 @@ class StateImpl(val descriptors: Descriptors, var neverExploredActions: Set[Acti
       transitions = transitions + (a -> (transitions(a) + to))
     }
   }
-}
+}
\ No newline at end of file
diff --git a/src/main/scala/de/retest/guistatemachine/rest/WebServer.scala b/src/main/scala/de/retest/guistatemachine/rest/WebServer.scala
index f53775f..3a261ea 100644
--- a/src/main/scala/de/retest/guistatemachine/rest/WebServer.scala
+++ b/src/main/scala/de/retest/guistatemachine/rest/WebServer.scala
@@ -50,4 +50,4 @@ object WebServer extends App with RestService {
         .onComplete(_ => system.terminate()) // and shutdown when done
     case None => println("Missing config.")
   }
-}
+}
\ No newline at end of file
diff --git a/src/test/scala/de/retest/guistatemachine/api/impl/GuiStateMachineImplSpec.scala b/src/test/scala/de/retest/guistatemachine/api/impl/GuiStateMachineImplSpec.scala
index ed4fa45..4ca2835 100644
--- a/src/test/scala/de/retest/guistatemachine/api/impl/GuiStateMachineImplSpec.scala
+++ b/src/test/scala/de/retest/guistatemachine/api/impl/GuiStateMachineImplSpec.scala
@@ -7,42 +7,59 @@ class GuiStateMachineImplSpec extends AbstractApiSpec {
   val sut = new GuiStateMachineImpl
   val rootElementA = getRootElement("a")
   val rootElementB = getRootElement("b")
+  val rootElementC = getRootElement("c")
   val action0Mock = getAction()
   val action1Mock = getAction()
 
   "GuiStateMachine" should {
-    "get an initial state" in {
-      val initial = sut.getState(getDescriptors, getNeverExploredActions)
-      initial.getNeverExploredActions.size shouldEqual 2
-      initial.getTransitions.size shouldEqual 0
-    }
-
-    "add two transitions to two new states for the same action" in {
+    "add two transitions to two new states for the same action and one transition to another state for another action" in {
       val initialDescriptors = getDescriptors
       val initial = sut.getState(getDescriptors, getNeverExploredActions)
+      sut.getAllExploredActions.size shouldEqual 0
+      sut.getAllNeverExploredActions.size shouldEqual 2
 
+      // execute action0Mock for the first time
       val s0Descriptors = Descriptors(Set(rootElementA))
-      // It should be a new state and not the same again.
-      initialDescriptors.equals(s0Descriptors) shouldEqual false
       val s0 = sut.executeAction(initial, Action(action0Mock), s0Descriptors, getNeverExploredActions)
       initial.getNeverExploredActions.size shouldEqual 1
       initial.getTransitions.size shouldEqual 1
       initial.getTransitions(Action(action0Mock)).size shouldEqual 1
       s0.getNeverExploredActions.size shouldEqual 2
       s0.getTransitions.size shouldEqual 0
+      sut.getAllExploredActions.size shouldEqual 1
+      sut.getAllNeverExploredActions.size shouldEqual 1
 
+      // execute action0Mock for the second time
       val s1Descriptors = Descriptors(Set(rootElementB))
-      // It should be a new state and not the same again.
-      initialDescriptors.equals(s1Descriptors) shouldEqual false
       val s1 = sut.executeAction(initial, Action(action0Mock), s1Descriptors, getNeverExploredActions)
       initial.getNeverExploredActions.size shouldEqual 1
       initial.getTransitions.size shouldEqual 1
       initial.getTransitions(Action(action0Mock)).size shouldEqual 2
       s1.getNeverExploredActions.size shouldEqual 2
       s1.getTransitions.size shouldEqual 0
+      sut.getAllExploredActions.size shouldEqual 1
+      sut.getAllNeverExploredActions.size shouldEqual 1
+
+      // execute action1Mock for the first time
+      val s2Descriptors = Descriptors(Set(rootElementC))
+      val s2 = sut.executeAction(initial, Action(action1Mock), s2Descriptors, getNeverExploredActions)
+      initial.getNeverExploredActions.size shouldEqual 0
+      initial.getTransitions.size shouldEqual 2
+      initial.getTransitions(Action(action1Mock)).size shouldEqual 1
+      s2.getNeverExploredActions.size shouldEqual 2
+      s2.getTransitions.size shouldEqual 0
+      sut.getAllExploredActions.size shouldEqual 2
+      sut.getAllNeverExploredActions.size shouldEqual 0
+    }
+
+    "store a state for the second access" in {
+      val initialDescriptors = getDescriptors
+      val initialFromAccess0 = sut.getState(getDescriptors, getNeverExploredActions)
+      val initialFromAccess1 = sut.getState(getDescriptors, getNeverExploredActions)
+      initialFromAccess0 shouldEqual initialFromAccess1
     }
   }
 
-  def getDescriptors: Descriptors = Descriptors(Set(rootElementA, rootElementB))
+  def getDescriptors: Descriptors = Descriptors(Set(rootElementA, rootElementB, rootElementC))
   def getNeverExploredActions: Set[Action] = Set(Action(action0Mock), Action(action1Mock))
-}
+}
\ No newline at end of file
diff --git a/src/test/scala/de/retest/guistatemachine/api/impl/StateImplSpec.scala b/src/test/scala/de/retest/guistatemachine/api/impl/StateImplSpec.scala
index 4efb196..54a0ae6 100644
--- a/src/test/scala/de/retest/guistatemachine/api/impl/StateImplSpec.scala
+++ b/src/test/scala/de/retest/guistatemachine/api/impl/StateImplSpec.scala
@@ -2,32 +2,40 @@ package de.retest.guistatemachine.api.impl
 
 import de.retest.guistatemachine.api.{AbstractApiSpec, Action, Descriptors}
 
-import scala.collection.immutable.HashSet
-
 class StateImplSpec extends AbstractApiSpec {
 
-  val descriptorsA = Descriptors(HashSet(getRootElement("a")))
-  val descriptorsB = Descriptors(HashSet(getRootElement("b")))
+  val descriptorsA = Descriptors(Set(getRootElement("a")))
+  val descriptorsB = Descriptors(Set(getRootElement("b")))
   val action0Mock = getAction()
   val action1Mock = getAction()
 
   "StateImpl" should {
     "not equal" in {
-      val s0 = new StateImpl(descriptorsA, HashSet(Action(action0Mock)))
-      val s1 = new StateImpl(descriptorsB, HashSet(Action(action1Mock)))
+      val s0 = new StateImpl(descriptorsA, Set(Action(action0Mock)))
+      val s1 = new StateImpl(descriptorsB, Set(Action(action1Mock)))
       s0.equals(s1) shouldEqual false
       s0.equals(null) shouldEqual false
     }
 
     "equal" in {
-      val s0 = new StateImpl(descriptorsA, HashSet(Action(action0Mock)))
-      val s1 = new StateImpl(descriptorsA, HashSet(Action(action1Mock)))
+      val s0 = new StateImpl(descriptorsA, Set(Action(action0Mock)))
+      val s1 = new StateImpl(descriptorsA, Set(Action(action1Mock)))
       s0.equals(s1) shouldEqual true
     }
 
     "be converted into a string" in {
-      val s0 = new StateImpl(descriptorsA, HashSet(Action(action0Mock)))
+      val s0 = new StateImpl(descriptorsA, Set(Action(action0Mock)))
       s0.toString shouldEqual "descriptors=Descriptors(Set()),neverExploredActions=Set(Selenium Action),transitions=Map()"
     }
+
+    "have a random action" in {
+      val s0 = new StateImpl(descriptorsA, Set(Action(action0Mock)))
+      s0.getRandomAction().isDefined shouldEqual true
+    }
+
+    "have no random action" in {
+      val s0 = new StateImpl(descriptorsA, Set())
+      s0.getRandomAction().isEmpty shouldEqual true
+    }
   }
-}
+}
\ No newline at end of file