diff --git a/de.prob.ui/plugin.xml b/de.prob.ui/plugin.xml
index d1b07bd82110aa5b4467bc12b6c9d1cb75165606..31a3a0a82deaec1c94bd4eea20d9cfd4df7530db 100644
--- a/de.prob.ui/plugin.xml
+++ b/de.prob.ui/plugin.xml
@@ -284,6 +284,12 @@
          <state class="org.eclipse.jface.commands.ToggleState"
             id="de.prob.ui.stateview.duplicateFilterState" />
       </command>
+      <command
+            id="de.prob.ui.history.toggleShowParameters"
+            name="Show event parameters">
+         <state class="org.eclipse.jface.commands.ToggleState"
+            id="de.prob.ui.history.showParametersState" />
+      </command>
       <command
             id="de.prob.ui.show_parameter_dialog"
             name="Show Parameter Dialog">
@@ -608,6 +614,20 @@
             </with>
          </enabledWhen>
       </handler>
+      <handler
+            commandId="de.prob.ui.history.toggleShowParameters">
+         <class
+               class="de.prob.ui.historyview.ToggleShowParametersHandler">
+         </class>
+         <enabledWhen>
+            <with
+                  variable="de.prob.core.model_loaded">
+               <equals
+                     value="enabled">
+               </equals>
+            </with>
+         </enabledWhen>
+      </handler>
       <handler
             commandId="de.prob.ui.show_parameter_dialog">
          <class
@@ -790,6 +810,15 @@
                style="push">
          </command>
       </menuContribution>
+      <menuContribution
+            locationURI="toolbar:de.prob.ui.HistoryView">
+         <command
+               commandId="de.prob.ui.history.toggleShowParameters"
+               icon="icons/filter_ps.gif"
+               label="Show Parameters"
+               style="toggle">
+         </command>
+      </menuContribution>
       
       <menuContribution
       locationURI="toolbar:de.prob.ui.OperationView">
diff --git a/de.prob.ui/src/de/prob/ui/historyview/HistoryEventLabelProvider.java b/de.prob.ui/src/de/prob/ui/historyview/HistoryEventLabelProvider.java
index f407ed98c034bc03d58546d176b7347400f68b28..8f3a80100bec876443f07a8ad0c8866b5066b8a8 100644
--- a/de.prob.ui/src/de/prob/ui/historyview/HistoryEventLabelProvider.java
+++ b/de.prob.ui/src/de/prob/ui/historyview/HistoryEventLabelProvider.java
@@ -1,5 +1,6 @@
 package de.prob.ui.historyview;
 
+import java.util.Collection;
 import java.util.List;
 
 import de.prob.core.domainobjects.Operation;
@@ -27,10 +28,16 @@ class HistoryEventLabelProvider extends HistoryLabelProvider {
 		if (operation != null) {
 			List<EventStackElement> stack = operation.getEventStack();
 			if (stack != null) {
-				result = eventStackPosition < stack.size() ? stack.get(
-						eventStackPosition).getEventName() : null;
+				if (eventStackPosition < stack.size()) {
+					EventStackElement stackElem = stack.get(eventStackPosition);
+					result = printEventWithParameters(stackElem.getEventName(),
+							stackElem.getParameters());
+				} else {
+					result = null;
+				}
 			} else {
-				result = eventStackPosition == 0 ? operation.getName() : null;
+				result = eventStackPosition == 0 ? printEventWithParameters(
+						operation.getName(), operation.getArguments()) : null;
 			}
 		} else {
 			result = eventStackPosition == 0 ? HistoryViewStrings.uninitialisedState
@@ -39,4 +46,27 @@ class HistoryEventLabelProvider extends HistoryLabelProvider {
 		return result == null ? "" : result;
 	}
 
+	private String printEventWithParameters(final String name,
+			final Collection<String> parameters) {
+		final String result;
+		if (!showParameters || parameters.isEmpty()) {
+			result = name;
+		} else {
+			StringBuilder sb = new StringBuilder();
+			sb.append(name);
+			sb.append('(');
+			boolean isFirst = true;
+			for (final String param : parameters) {
+				if (!isFirst) {
+					sb.append(',');
+				}
+				sb.append(param);
+				isFirst = false;
+			}
+			sb.append(')');
+			result = sb.toString();
+		}
+		return result;
+	}
+
 }
\ No newline at end of file
diff --git a/de.prob.ui/src/de/prob/ui/historyview/HistoryLabelProvider.java b/de.prob.ui/src/de/prob/ui/historyview/HistoryLabelProvider.java
index 950d972b0f8b6b732e0bf5c5f2033f0d18e4263b..818e3e2bea695445c1ac6f19f0e9c0bd8abc3e79 100644
--- a/de.prob.ui/src/de/prob/ui/historyview/HistoryLabelProvider.java
+++ b/de.prob.ui/src/de/prob/ui/historyview/HistoryLabelProvider.java
@@ -24,6 +24,8 @@ public abstract class HistoryLabelProvider extends CellLabelProvider {
 	final Font bold = JFaceResources.getFontRegistry().getBold(
 			JFaceResources.BANNER_FONT);
 
+	protected boolean showParameters;
+
 	@Override
 	public void update(final ViewerCell cell) {
 		final Object element = cell.getElement();
@@ -51,4 +53,8 @@ public abstract class HistoryLabelProvider extends CellLabelProvider {
 	protected Color getForeground(final HistViewItem item) {
 		return null;
 	}
+
+	public void setShowParameters(final boolean show) {
+		showParameters = show;
+	}
 }
diff --git a/de.prob.ui/src/de/prob/ui/historyview/HistoryView.java b/de.prob.ui/src/de/prob/ui/historyview/HistoryView.java
index 1b07a0246949381fe9abf814674c00133517f4d5..b6dd099a042da661381d6295ff864e791e9fccd5 100644
--- a/de.prob.ui/src/de/prob/ui/historyview/HistoryView.java
+++ b/de.prob.ui/src/de/prob/ui/historyview/HistoryView.java
@@ -3,6 +3,7 @@
  */
 package de.prob.ui.historyview;
 
+import java.util.ArrayList;
 import java.util.Collection;
 
 import org.apache.commons.lang.ArrayUtils;
@@ -54,6 +55,7 @@ public class HistoryView extends StateBasedViewPart {
 	public static final String VIEW_ID = "de.prob.ui.HistoryView";
 
 	private TableViewer tableViewer;
+	private Collection<HistoryLabelProvider> labelProviders;
 
 	@Override
 	protected Control createStatePartControl(final Composite parent) {
@@ -164,21 +166,23 @@ public class HistoryView extends StateBasedViewPart {
 
 	private void createColumns(final Composite composite) {
 		final Animator animator = Animator.getAnimator();
-		MachineDescription machineDescription = animator.getMachineDescription();
+		MachineDescription machineDescription = animator
+				.getMachineDescription();
 		String[] models = new String[0];
 		if (machineDescription != null) {
-			models = machineDescription
-					.getModelNames().toArray(new String[0]);
+			models = machineDescription.getModelNames().toArray(new String[0]);
 			ArrayUtils.reverse(models);
 		}
 		final TableColumnLayout layout = new TableColumnLayout();
 		composite.setLayout(layout);
+		labelProviders = new ArrayList<HistoryLabelProvider>();
 		if (models.length > 0) {
 			int pos = 0;
 			for (final String model : models) {
 				final boolean isFirst = pos == 0;
-				createColumn(layout, model, new HistoryEventLabelProvider(pos),
-						isFirst);
+				final HistoryEventLabelProvider labelProvider = new HistoryEventLabelProvider(
+						pos);
+				createColumn(layout, model, labelProvider, isFirst);
 				pos++;
 			}
 		} else {
@@ -200,6 +204,7 @@ public class HistoryView extends StateBasedViewPart {
 		final ColumnWeightData weightData = setMinimumSize ? new ColumnWeightData(
 				1, 100) : new ColumnWeightData(1);
 		layout.setColumnData(column, weightData);
+		labelProviders.add(labelProvider);
 	}
 
 	@Override
@@ -320,4 +325,19 @@ public class HistoryView extends StateBasedViewPart {
 		}
 	}
 
+	public void setShowParameters(boolean show) {
+		if (labelProviders != null) {
+			for (HistoryLabelProvider provider : labelProviders) {
+				provider.setShowParameters(show);
+			}
+		}
+		final Runnable runnable = new Runnable() {
+			@Override
+			public void run() {
+				tableViewer.refresh();
+			}
+		};
+		Display.getDefault().asyncExec(runnable);
+	}
+
 }
diff --git a/de.prob.ui/src/de/prob/ui/historyview/ToggleShowParametersHandler.java b/de.prob.ui/src/de/prob/ui/historyview/ToggleShowParametersHandler.java
new file mode 100644
index 0000000000000000000000000000000000000000..b907bac3bdeb47b30fb724d337fd6db154bf6d33
--- /dev/null
+++ b/de.prob.ui/src/de/prob/ui/historyview/ToggleShowParametersHandler.java
@@ -0,0 +1,79 @@
+/**
+ * 
+ */
+package de.prob.ui.historyview;
+
+import java.util.Map;
+
+import org.eclipse.core.commands.AbstractHandler;
+import org.eclipse.core.commands.Command;
+import org.eclipse.core.commands.ExecutionEvent;
+import org.eclipse.core.commands.ExecutionException;
+import org.eclipse.core.commands.IHandler;
+import org.eclipse.core.commands.State;
+import org.eclipse.ui.IWorkbenchPage;
+import org.eclipse.ui.PlatformUI;
+import org.eclipse.ui.commands.ICommandService;
+import org.eclipse.ui.commands.IElementUpdater;
+import org.eclipse.ui.menus.UIElement;
+import org.eclipse.ui.services.IServiceLocator;
+
+import de.prob.ui.stateview.StateViewPart;
+
+/**
+ * @author plagge
+ * 
+ */
+public class ToggleShowParametersHandler extends AbstractHandler implements
+		IHandler, IElementUpdater {
+	private static final String COMMAND_ID = "de.prob.ui.history.toggleShowParameters";
+	private static final String STATE_ID = "de.prob.ui.history.showParametersState";
+
+	@Override
+	public Object execute(ExecutionEvent event) throws ExecutionException {
+		final State state = event.getCommand().getState(STATE_ID);
+		if (state != null) {
+			final boolean newFilterValue = toggleState(state);
+			setShowParameters(newFilterValue);
+		} else
+			throw new ExecutionException("Command state " + STATE_ID
+					+ " not found");
+		return null;
+	}
+
+	private boolean toggleState(final State state) {
+		final Boolean show = (Boolean) state.getValue();
+		state.setValue(!show);
+		return !show;
+	}
+
+	private void setShowParameters(final boolean show)
+			throws ExecutionException {
+		final IWorkbenchPage page = PlatformUI.getWorkbench()
+				.getActiveWorkbenchWindow().getActivePage();
+		final HistoryView view = (HistoryView) page
+				.findView(HistoryView.VIEW_ID);
+		if (view != null) {
+			view.setShowParameters(show);
+		} else
+			throw new ExecutionException("View " + StateViewPart.STATE_VIEW_ID
+					+ " not found");
+	}
+
+	@Override
+	public void updateElement(UIElement element,
+			@SuppressWarnings("rawtypes") Map parameters) {
+		final State state = getCurrentState(element.getServiceLocator());
+		final Boolean filterSet = (Boolean) state.getValue();
+		element.setChecked(filterSet);
+	}
+
+	private static State getCurrentState(final IServiceLocator locator) {
+		final ICommandService service = (ICommandService) locator
+				.getService(ICommandService.class);
+		final Command command = service.getCommand(COMMAND_ID);
+		final State state = command.getState(STATE_ID);
+		return state;
+	}
+
+}