diff --git a/MMTk/src/org/mmtk/plan/ThirdParty.java b/MMTk/src/org/mmtk/plan/ThirdParty.java
new file mode 100644
index 0000000000..88c8a1c47d
--- /dev/null
+++ b/MMTk/src/org/mmtk/plan/ThirdParty.java
@@ -0,0 +1,39 @@
+/*
+ *  This file is part of the Jikes RVM project (http://jikesrvm.org).
+ *
+ *  This file is licensed to You under the Eclipse Public License (EPL);
+ *  You may not use this file except in compliance with the License. You
+ *  may obtain a copy of the License at
+ *
+ *      http://www.opensource.org/licenses/eclipse-1.0.php
+ *
+ *  See the COPYRIGHT.txt file distributed with this work for information
+ *  regarding copyright ownership.
+ */
+package org.mmtk.plan;
+
+import org.mmtk.policy.Space;
+import org.mmtk.utility.Log;
+import org.mmtk.utility.alloc.Allocator;
+import org.mmtk.utility.options.*;
+import org.mmtk.utility.statistics.Timer;
+import org.mmtk.vm.VM;
+
+import org.vmmagic.pragma.*;
+
+/**
+ * This abstract class implements the core functionality for
+ * simple collectors.<p>
+ *
+ * This class defines the collection phases, and provides base
+ * level implementations of them.  Subclasses should provide
+ * implementations for the spaces that they introduce, and
+ * delegate up the class hierarchy.<p>
+ *
+ * For details of the split between global and thread-local operations
+ * @see org.mmtk.plan.Plan
+ */
+@Uninterruptible
+public class ThirdParty extends Simple {
+
+}
\ No newline at end of file
diff --git a/MMTk/src/org/mmtk/plan/ThirdPartyCollector.java b/MMTk/src/org/mmtk/plan/ThirdPartyCollector.java
new file mode 100644
index 0000000000..7a77b3989f
--- /dev/null
+++ b/MMTk/src/org/mmtk/plan/ThirdPartyCollector.java
@@ -0,0 +1,36 @@
+/*
+ *  This file is part of the Jikes RVM project (http://jikesrvm.org).
+ *
+ *  This file is licensed to You under the Eclipse Public License (EPL);
+ *  You may not use this file except in compliance with the License. You
+ *  may obtain a copy of the License at
+ *
+ *      http://www.opensource.org/licenses/eclipse-1.0.php
+ *
+ *  See the COPYRIGHT.txt file distributed with this work for information
+ *  regarding copyright ownership.
+ */
+package org.mmtk.plan;
+
+import org.mmtk.utility.Log;
+import org.mmtk.utility.options.Options;
+import org.mmtk.utility.sanitychecker.SanityCheckerLocal;
+
+import org.mmtk.vm.VM;
+
+import org.vmmagic.pragma.*;
+
+/**
+ * This class (and its sub-classes) implement <i>per-collector thread</i>
+ * behavior and state.<p>
+ *
+ * MMTk assumes that the VM instantiates instances of CollectorContext
+ * in thread local storage (TLS) for each thread participating in
+ * collection.  Accesses to this state are therefore assumed to be
+ * low-cost during mutator time.
+ *
+ * @see CollectorContext
+ */
+@Uninterruptible
+public class ThirdPartyCollector extends SimpleCollector {
+}
\ No newline at end of file
diff --git a/MMTk/src/org/mmtk/plan/ThirdPartyConstraints.java b/MMTk/src/org/mmtk/plan/ThirdPartyConstraints.java
new file mode 100644
index 0000000000..7a27717d83
--- /dev/null
+++ b/MMTk/src/org/mmtk/plan/ThirdPartyConstraints.java
@@ -0,0 +1,38 @@
+/*
+ *  This file is part of the Jikes RVM project (http://jikesrvm.org).
+ *
+ *  This file is licensed to You under the Eclipse Public License (EPL);
+ *  You may not use this file except in compliance with the License. You
+ *  may obtain a copy of the License at
+ *
+ *      http://www.opensource.org/licenses/eclipse-1.0.php
+ *
+ *  See the COPYRIGHT.txt file distributed with this work for information
+ *  regarding copyright ownership.
+ */
+package org.mmtk.plan;
+
+import org.vmmagic.pragma.*;
+
+/**
+ * Constraints specific to simple collectors.
+ */
+@Uninterruptible
+public class ThirdPartyConstraints extends SimpleConstraints {
+    // A third party GC may not move objects. But unless we have a way for a TPH
+    // to configure this, we need this to be true to be correct.
+    @Override
+    public boolean movesObjects() {
+      return true;
+    }
+    // The number doesnt matter.
+    @Override
+    public int gcHeaderBits() {
+      return 0;
+    }
+    // The number doesnt matter.
+    @Override
+    public int gcHeaderWords() {
+      return 0;
+    }
+}