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diff --git a/qpid/java/systests/src/main/java/org/apache/qpid/test/framework/DropInTest.java b/qpid/java/systests/src/main/java/org/apache/qpid/test/framework/DropInTest.java
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+++ b/qpid/java/systests/src/main/java/org/apache/qpid/test/framework/DropInTest.java
@@ -0,0 +1,51 @@
+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 org.apache.qpid.test.framework;
+
+import javax.jms.JMSException;
+import javax.jms.Message;
+
+/**
+ * A DropIn test is a test case that can accept late joining test clients into a running test. This can be usefull,
+ * for interactive experimentation.
+ *
+ * <p/><table id="crc"><caption>CRC Card</caption>
+ * <tr><th> Responsibilities
+ * <tr><td> Accept late joining test clients.
+ * </table>
+ */
+public interface DropInTest
+{
+    /**
+     * Should accept a late joining client into a running test case. The client will be enlisted with a control message
+     * with the 'CONTROL_TYPE' field set to the value 'LATEJOIN'. It should also provide values for the fields:
+     *
+     * <p/><table>
+     * <tr><td> CLIENT_NAME <td> A unique name for the new client.
+     * <tr><td> CLIENT_PRIVATE_CONTROL_KEY <td> The key for the route on which the client receives its control messages.
+     * </table>
+     *
+     * @param message The late joiners join message.
+     *
+     * @throws JMSException Any JMS Exception are allowed to fall through, indicating that the join failed.
+     */
+    public void lateJoin(Message message) throws JMSException;
+}