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diff --git a/dotnet/Qpid.Integration.Tests/framework/clocksynch/ClockSynchronizer.csx b/dotnet/Qpid.Integration.Tests/framework/clocksynch/ClockSynchronizer.csx
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+++ b/dotnet/Qpid.Integration.Tests/framework/clocksynch/ClockSynchronizer.csx
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+/*
+ *
+ * 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.
+ *
+ */
+namespace Apache.Qpid.Integration.Tests.framework.clocksynch
+{
+    /// <summary>
+    /// ClockSynchronizer provides an interface through which two nodes may synchronize their clocks. It is expected that one
+    /// node will act as the reference clock, to which no delta need be applied, and the other node will act as the slave,
+    /// and which must apply a delta to its local clock to get a clock synchronized with the reference.
+    ///
+    /// <p/>The slave side will initiate the computation of a clock delta by calling the <see cref="#synch"/> method. This method
+    /// will not return until the delta has been computed, at which point there is a method to return its value, as well as
+    /// an estimate of the likely error (usually one standard deviation), in the synchronization. For convenience there is a
+    /// <see cref="#nanoTime"/> method to return the value of System.nanoTime() with the delta added in.
+    ///
+    /// <p/><table id="crc"><caption>CRC Card</caption>
+    /// <tr><th> Responsibilities <th> Collaborations
+    /// <tr><td> Trigger a clock synchronization.
+    /// <tr><td> Compute a clock delta to apply to the local clock.
+    /// <tr><td> Estimate the error in the synchronzation.
+    /// </table>
+    /// </summary>
+    public interface ClockSynchronizer
+    {
+        /// <summary>
+        /// The slave side should call this to copute a clock delta with the reference.
+        /// </summary>
+        /// <exception cref="ClockSynchFailureException"> If synchronization cannot be achieved. </exception>
+        public void synch() throws ClockSynchFailureException;
+
+        /// <summary>
+        /// Gets the clock delta in nano seconds.
+        /// </summary>
+        /// <return> The clock delta in nano seconds. </return>
+        public long getDelta();
+
+        /// <summary>
+        /// Gets an estimate of the clock error in nan seconds.
+        /// </summary>
+        /// <return> An estimate of the clock error in nan seconds. </return>
+        public long getEpsilon();
+
+        /// <summary>
+        /// Gets the local clock time with any computed delta added in.
+        /// </summary>
+        /// <return> The local clock time with any computed delta added in. </return>
+        public long nanoTime();
+    }
+}
+\ No newline at end of file