diff --git a/gerrit-extension-api/src/main/java/com/google/gerrit/extensions/common/ChangeStatus.java b/gerrit-extension-api/src/main/java/com/google/gerrit/extensions/common/ChangeStatus.java
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+++ b/gerrit-extension-api/src/main/java/com/google/gerrit/extensions/common/ChangeStatus.java
@@ -0,0 +1,101 @@
+// Copyright (C) 2014 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.google.gerrit.extensions.common;
+
+/* Current state within the basic workflow of the change **/
+public enum ChangeStatus {
+
+  /**
+   * Change is open and pending review, or review is in progress.
+   *
+   * <p>
+   * This is the default state assigned to a change when it is first created
+   * in the database. A change stays in the NEW state throughout its review
+   * cycle, until the change is submitted or abandoned.
+   *
+   * <p>
+   * Changes in the NEW state can be moved to:
+   * <ul>
+   * <li>{@link #SUBMITTED} - when the Submit Patch Set action is used;
+   * <li>{@link #ABANDONED} - when the Abandon action is used.
+   * </ul>
+   */
+  NEW,
+
+  /**
+   * Change is open, but has been submitted to the merge queue.
+   *
+   * <p>
+   * A change enters the SUBMITTED state when an authorized user presses the
+   * "submit" action through the web UI, requesting that Gerrit merge the
+   * change's current patch set into the destination branch.
+   *
+   * <p>
+   * Typically a change resides in the SUBMITTED for only a brief sub-second
+   * period while the merge queue fires and the destination branch is updated.
+   * However, if a dependency commit (a {@link PatchSetAncestor}, directly or
+   * transitively) is not yet merged into the branch, the change will hang in
+   * the SUBMITTED state indefinitely.
+   *
+   * <p>
+   * Changes in the SUBMITTED state can be moved to:
+   * <ul>
+   * <li>{@link #NEW} - when a replacement patch set is supplied, OR when a
+   * merge conflict is detected;
+   * <li>{@link #MERGED} - when the change has been successfully merged into
+   * the destination branch;
+   * <li>{@link #ABANDONED} - when the Abandon action is used.
+   * </ul>
+   */
+  SUBMITTED,
+
+  /**
+   * Change is a draft change that only consists of draft patchsets.
+   *
+   * <p>
+   * This is a change that is not meant to be submitted or reviewed yet. If
+   * the uploader publishes the change, it becomes a NEW change.
+   * Publishing is a one-way action, a change cannot return to DRAFT status.
+   * Draft changes are only visible to the uploader and those explicitly
+   * added as reviewers.
+   *
+   * <p>
+   * Changes in the DRAFT state can be moved to:
+   * <ul>
+   * <li>{@link #NEW} - when the change is published, it becomes a new change;
+   * </ul>
+   */
+  DRAFT,
+
+  /**
+   * Change is closed, and submitted to its destination branch.
+   *
+   * <p>
+   * Once a change has been merged, it cannot be further modified by adding a
+   * replacement patch set. Draft comments however may be published,
+   * supporting a post-submit review.
+   */
+  MERGED,
+
+  /**
+   * Change is closed, but was not submitted to its destination branch.
+   *
+   * <p>
+   * Once a change has been abandoned, it cannot be further modified by adding
+   * a replacement patch set, and it cannot be merged. Draft comments however
+   * may be published, permitting reviewers to send constructive feedback.
+   */
+  ABANDONED
+}
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