diff --git a/hooks-its/src/main/java/com/googlesource/gerrit/plugins/hooks/ItsHookModule.java b/hooks-its/src/main/java/com/googlesource/gerrit/plugins/hooks/ItsHookModule.java
index c2a6183..b25d240 100644
--- a/hooks-its/src/main/java/com/googlesource/gerrit/plugins/hooks/ItsHookModule.java
+++ b/hooks-its/src/main/java/com/googlesource/gerrit/plugins/hooks/ItsHookModule.java
@@ -32,6 +32,7 @@
 import com.googlesource.gerrit.plugins.hooks.workflow.action.AddComment;
 import com.googlesource.gerrit.plugins.hooks.workflow.action.AddStandardComment;
 import com.googlesource.gerrit.plugins.hooks.workflow.action.AddVelocityComment;
+import com.googlesource.gerrit.plugins.hooks.workflow.action.LogEvent;
 
 public class ItsHookModule extends FactoryModule {
 
@@ -63,5 +64,6 @@
     factory(AddComment.Factory.class);
     factory(AddStandardComment.Factory.class);
     factory(AddVelocityComment.Factory.class);
+    factory(LogEvent.Factory.class);
   }
 }
diff --git a/hooks-its/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/ActionExecutor.java b/hooks-its/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/ActionExecutor.java
index ce098e2..99ccf85 100644
--- a/hooks-its/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/ActionExecutor.java
+++ b/hooks-its/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/ActionExecutor.java
@@ -26,6 +26,7 @@
 import com.googlesource.gerrit.plugins.hooks.workflow.action.AddComment;
 import com.googlesource.gerrit.plugins.hooks.workflow.action.AddStandardComment;
 import com.googlesource.gerrit.plugins.hooks.workflow.action.AddVelocityComment;
+import com.googlesource.gerrit.plugins.hooks.workflow.action.LogEvent;
 
 /**
  * Executes an {@link ActionRequest}
@@ -38,15 +39,18 @@
   private final AddComment.Factory addCommentFactory;
   private final AddStandardComment.Factory addStandardCommentFactory;
   private final AddVelocityComment.Factory addVelocityCommentFactory;
+  private final LogEvent.Factory logEventFactory;
 
   @Inject
   public ActionExecutor(ItsFacade its, AddComment.Factory addCommentFactory,
       AddStandardComment.Factory addStandardCommentFactory,
-      AddVelocityComment.Factory addVelocityCommentFactory) {
+      AddVelocityComment.Factory addVelocityCommentFactory,
+      LogEvent.Factory logEventFactory) {
     this.its = its;
     this.addCommentFactory = addCommentFactory;
     this.addStandardCommentFactory = addStandardCommentFactory;
     this.addVelocityCommentFactory = addVelocityCommentFactory;
+    this.logEventFactory = logEventFactory;
   }
 
   public void execute(String issue, ActionRequest actionRequest,
@@ -60,6 +64,8 @@
           action = addStandardCommentFactory.create();
       } else if ("add-velocity-comment".equals(name)) {
         action = addVelocityCommentFactory.create();
+      } else if ("log-event".equals(name)) {
+        action = logEventFactory.create();
       }
 
       if (action == null) {
diff --git a/hooks-its/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/action/LogEvent.java b/hooks-its/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/action/LogEvent.java
new file mode 100644
index 0000000..17b891d
--- /dev/null
+++ b/hooks-its/src/main/java/com/googlesource/gerrit/plugins/hooks/workflow/action/LogEvent.java
@@ -0,0 +1,88 @@
+// Copyright (C) 2013 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.googlesource.gerrit.plugins.hooks.workflow.action;
+
+import java.io.IOException;
+import java.util.Set;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.inject.Inject;
+import com.googlesource.gerrit.plugins.hooks.workflow.ActionRequest;
+import com.googlesource.gerrit.plugins.hooks.workflow.Property;
+
+/**
+ * Dumps the event's properties to the log.
+ *
+ * This event helps when developing rules as available properties become
+ * visible.
+ */
+public class LogEvent implements Action {
+  private static final Logger log = LoggerFactory.getLogger(LogEvent.class);
+
+  private enum Level { ERROR, WARN, INFO, DEBUG };
+
+  public interface Factory {
+    LogEvent create();
+  }
+
+  @Inject
+  public LogEvent() {
+  }
+
+  private void logProperty(Level level, Property property) {
+    String message = property.toString();
+    switch (level) {
+      case ERROR:
+        log.error(message);
+        break;
+      case WARN:
+        log.warn(message);
+        break;
+      case INFO:
+        log.info(message);
+        break;
+      case DEBUG:
+        log.debug(message);
+        break;
+      default:
+        log.error("Undefined log level.");
+    }
+  }
+
+  @Override
+  public void execute(String issue, ActionRequest actionRequest,
+      Set<Property> properties) throws IOException {
+    String levelParameter = actionRequest.getParameter(1);
+    if (levelParameter != null) {
+      levelParameter = levelParameter.toLowerCase();
+    }
+    Level level = Level.INFO;
+    if ("error".equals(levelParameter)) {
+      level = Level.ERROR;
+    } else if ("warn".equals(levelParameter)) {
+      level = Level.WARN;
+    } else if ("info".equals(levelParameter)) {
+      level = Level.INFO;
+    } else if ("debug".equals(levelParameter)) {
+      level = Level.DEBUG;
+    }
+
+    for (Property property : properties) {
+      logProperty(level, property);
+    }
+  }
+}
diff --git a/hooks-its/src/main/resources/Documentation/config.md b/hooks-its/src/main/resources/Documentation/config.md
index a2c4862..b0093ed 100644
--- a/hooks-its/src/main/resources/Documentation/config.md
+++ b/hooks-its/src/main/resources/Documentation/config.md
@@ -382,6 +382,8 @@
   adds a predefined standard comment for certain events
 <<action-add-velocity-comment,add-velocity-comment>>::
   adds a rendered Velocity template as issue comment.
+<<action-log-event,log-event>>::
+  appends the event's properties to Gerrit's log.
 
 Further actions may be provided by 'hooks-its' based plugins.
 
@@ -442,6 +444,24 @@
 the event's subject property, and +$change-number+ would refer to the
 change's number.
 
+[[action-log-event]]
+Action: log-event
+^^^^^^^^^^^^^^^^^
+
+The 'log-event' action appends the event's properties to Gerrit's log.
+
+Logging happens at the info level per default, but can be overriden by
+adding the desired log level as parameter. Supported values are
+'error', 'warn', 'info', and 'debug'). So for example
+----
+action = log-event error
+----
+appends the event's properties to Gerrit's log at error level. All
+other parameters are ignored.
+
+This action is useful when testing rules or trying to refine
+conditions on rules, as it make the available properties visible.
+
 
 [[config-legacy]]
 Legacy configuration
diff --git a/hooks-its/src/test/java/com/googlesource/gerrit/plugins/hooks/testutil/LoggingMockingTestCase.java b/hooks-its/src/test/java/com/googlesource/gerrit/plugins/hooks/testutil/LoggingMockingTestCase.java
index 70098e5..4878c40 100644
--- a/hooks-its/src/test/java/com/googlesource/gerrit/plugins/hooks/testutil/LoggingMockingTestCase.java
+++ b/hooks-its/src/test/java/com/googlesource/gerrit/plugins/hooks/testutil/LoggingMockingTestCase.java
@@ -21,18 +21,21 @@
 import org.junit.After;
 
 import java.util.Iterator;
+import org.apache.log4j.Level;
 
 public abstract class LoggingMockingTestCase extends MockingTestCase {
 
   private java.util.Collection<LoggingEvent> loggedEvents;
 
-  protected final void assertLogMessageContains(String needle) {
+  protected final void assertLogMessageContains(String needle, Level level) {
     LoggingEvent hit = null;
     Iterator<LoggingEvent> iter = loggedEvents.iterator();
     while (hit == null && iter.hasNext()) {
       LoggingEvent event = iter.next();
       if (event.getRenderedMessage().contains(needle)) {
-        hit = event;
+        if (level == null || level.equals(event.getLevel())) {
+          hit = event;
+        }
       }
     }
     assertNotNull("Could not find log message containing '" + needle + "'",
@@ -41,6 +44,10 @@
         loggedEvents.remove(hit));
   }
 
+  protected final void assertLogMessageContains(String needle) {
+    assertLogMessageContains(needle, null);
+  }
+
   protected final void assertLogThrowableMessageContains(String needle) {
     LoggingEvent hit = null;
     Iterator<LoggingEvent> iter = loggedEvents.iterator();
diff --git a/hooks-its/src/test/java/com/googlesource/gerrit/plugins/hooks/workflow/ActionExecutorTest.java b/hooks-its/src/test/java/com/googlesource/gerrit/plugins/hooks/workflow/ActionExecutorTest.java
index 7cc2597..63293e1 100644
--- a/hooks-its/src/test/java/com/googlesource/gerrit/plugins/hooks/workflow/ActionExecutorTest.java
+++ b/hooks-its/src/test/java/com/googlesource/gerrit/plugins/hooks/workflow/ActionExecutorTest.java
@@ -29,6 +29,7 @@
 import com.googlesource.gerrit.plugins.hooks.workflow.action.AddComment;
 import com.googlesource.gerrit.plugins.hooks.workflow.action.AddStandardComment;
 import com.googlesource.gerrit.plugins.hooks.workflow.action.AddVelocityComment;
+import com.googlesource.gerrit.plugins.hooks.workflow.action.LogEvent;
 
 public class ActionExecutorTest extends LoggingMockingTestCase {
   private Injector injector;
@@ -37,6 +38,7 @@
   private AddComment.Factory addCommentFactory;
   private AddStandardComment.Factory addStandardCommentFactory;
   private AddVelocityComment.Factory addVelocityCommentFactory;
+  private LogEvent.Factory logEventFactory;
 
   public void testExecuteItem() throws IOException {
     ActionRequest actionRequest = createMock(ActionRequest.class);
@@ -176,6 +178,23 @@
     actionExecutor.execute("4711", actionRequest, properties);
   }
 
+  public void testLogEventDelegation() throws IOException {
+    ActionRequest actionRequest = createMock(ActionRequest.class);
+    expect(actionRequest.getName()).andReturn("log-event");
+
+    Set<Property> properties = Collections.emptySet();
+
+    LogEvent logEvent = createMock(LogEvent.class);
+    expect(logEventFactory.create()).andReturn(logEvent);
+
+    logEvent.execute("4711", actionRequest, properties);
+
+    replayMocks();
+
+    ActionExecutor actionExecutor = createActionExecutor();
+    actionExecutor.execute("4711", actionRequest, properties);
+  }
+
   private ActionExecutor createActionExecutor() {
     return injector.getInstance(ActionExecutor.class);
   }
@@ -201,6 +220,9 @@
       addVelocityCommentFactory = createMock(AddVelocityComment.Factory.class);
       bind(AddVelocityComment.Factory.class).toInstance(
           addVelocityCommentFactory);
+
+      logEventFactory = createMock(LogEvent.Factory.class);
+      bind(LogEvent.Factory.class).toInstance(logEventFactory);
     }
   }
 }
\ No newline at end of file
diff --git a/hooks-its/src/test/java/com/googlesource/gerrit/plugins/hooks/workflow/action/LogEventTest.java b/hooks-its/src/test/java/com/googlesource/gerrit/plugins/hooks/workflow/action/LogEventTest.java
new file mode 100644
index 0000000..7d607b2
--- /dev/null
+++ b/hooks-its/src/test/java/com/googlesource/gerrit/plugins/hooks/workflow/action/LogEventTest.java
@@ -0,0 +1,161 @@
+// Copyright (C) 2013 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package com.googlesource.gerrit.plugins.hooks.workflow.action;
+
+import static org.easymock.EasyMock.expect;
+
+import java.io.IOException;
+import java.util.HashSet;
+import java.util.Set;
+
+import org.apache.log4j.Level;
+
+import com.google.common.collect.Sets;
+import com.google.gerrit.server.config.FactoryModule;
+import com.google.inject.Guice;
+import com.google.inject.Injector;
+import com.googlesource.gerrit.plugins.hooks.testutil.LoggingMockingTestCase;
+import com.googlesource.gerrit.plugins.hooks.workflow.ActionRequest;
+import com.googlesource.gerrit.plugins.hooks.workflow.Property;
+
+public class LogEventTest extends LoggingMockingTestCase {
+  private Injector injector;
+
+  public void testEmpty() throws IOException {
+    ActionRequest actionRequest = createMock(ActionRequest.class);
+    expect(actionRequest.getParameter(1)).andReturn("");
+
+    replayMocks();
+
+    LogEvent logEvent = createLogEvent();
+    logEvent.execute("4711", actionRequest, new HashSet<Property>());
+  }
+
+  public void testLevelDefault() throws IOException {
+    ActionRequest actionRequest = createMock(ActionRequest.class);
+    expect(actionRequest.getParameter(1)).andReturn("");
+
+    Set<Property> properties = Sets.newHashSet();
+    properties.add(new PropertyMock("KeyA", "ValueA", "PropertyA"));
+    replayMocks();
+
+    LogEvent logEvent = createLogEvent();
+    logEvent.execute("4711", actionRequest, properties);
+
+    assertLogMessageContains("PropertyA", Level.INFO);
+  }
+
+  public void testLevelError() throws IOException {
+    ActionRequest actionRequest = createMock(ActionRequest.class);
+    expect(actionRequest.getParameter(1)).andReturn("error");
+
+    Set<Property> properties = Sets.newHashSet();
+    properties.add(new PropertyMock("KeyA", "ValueA", "PropertyA"));
+    replayMocks();
+
+    LogEvent logEvent = createLogEvent();
+    logEvent.execute("4711", actionRequest, properties);
+
+    assertLogMessageContains("PropertyA", Level.ERROR);
+  }
+
+  public void testLevelWarn() throws IOException {
+    ActionRequest actionRequest = createMock(ActionRequest.class);
+    expect(actionRequest.getParameter(1)).andReturn("warn");
+
+    Set<Property> properties = Sets.newHashSet();
+    properties.add(new PropertyMock("KeyA", "ValueA", "PropertyA"));
+    replayMocks();
+
+    LogEvent logEvent = createLogEvent();
+    logEvent.execute("4711", actionRequest, properties);
+
+    assertLogMessageContains("PropertyA", Level.WARN);
+  }
+
+  public void testLevelInfo() throws IOException {
+    ActionRequest actionRequest = createMock(ActionRequest.class);
+    expect(actionRequest.getParameter(1)).andReturn("info");
+
+    Set<Property> properties = Sets.newHashSet();
+    properties.add(new PropertyMock("KeyA", "ValueA", "PropertyA"));
+    replayMocks();
+
+    LogEvent logEvent = createLogEvent();
+    logEvent.execute("4711", actionRequest, properties);
+
+    assertLogMessageContains("PropertyA", Level.INFO);
+  }
+
+  public void testLevelDebug() throws IOException {
+    ActionRequest actionRequest = createMock(ActionRequest.class);
+    expect(actionRequest.getParameter(1)).andReturn("debug");
+
+    Set<Property> properties = Sets.newHashSet();
+    properties.add(new PropertyMock("KeyA", "ValueA", "PropertyA"));
+    replayMocks();
+
+    LogEvent logEvent = createLogEvent();
+    logEvent.execute("4711", actionRequest, properties);
+
+    assertLogMessageContains("PropertyA", Level.DEBUG);
+  }
+
+  public void testMultipleProperties() throws IOException {
+    ActionRequest actionRequest = createMock(ActionRequest.class);
+    expect(actionRequest.getParameter(1)).andReturn("info");
+
+
+    Set<Property> properties = Sets.newHashSet();
+    properties.add(new PropertyMock("KeyA", "ValueA", "PropertyA"));
+    properties.add(new PropertyMock("KeyB", "ValueB", "PropertyB"));
+    properties.add(new PropertyMock("KeyC", "ValueC", "PropertyC"));
+    replayMocks();
+
+    LogEvent logEvent = createLogEvent();
+    logEvent.execute("4711", actionRequest, properties);
+
+    assertLogMessageContains("PropertyA", Level.INFO);
+    assertLogMessageContains("PropertyB", Level.INFO);
+    assertLogMessageContains("PropertyC", Level.INFO);
+  }
+
+  private LogEvent createLogEvent() {
+    return injector.getInstance(LogEvent.class);
+  }
+
+  public void setUp() throws Exception {
+    super.setUp();
+    injector = Guice.createInjector(new TestModule());
+  }
+
+  private class TestModule extends FactoryModule {
+    @Override
+    protected void configure() {
+    }
+  }
+
+  private class PropertyMock extends Property {
+    private final String toString;
+
+    public PropertyMock(String key, String value, String toString) {
+      super(key, value);
+      this.toString = toString;
+    }
+
+    public String toString() {
+      return toString;
+    }
+  }
+}
\ No newline at end of file