diff --git a/update_manager/policy.cc b/update_manager/policy.cc
new file mode 100644
index 0000000..41ff8c1
--- /dev/null
+++ b/update_manager/policy.cc
@@ -0,0 +1,25 @@
+// Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "update_engine/update_manager/policy.h"
+
+#include <string>
+
+using std::string;
+
+namespace chromeos_update_manager {
+
+string ToString(EvalStatus status) {
+  switch (status) {
+    case EvalStatus::kFailed:
+      return "kFailed";
+    case EvalStatus::kSucceeded:
+      return "kSucceeded";
+    case EvalStatus::kAskMeAgainLater:
+      return "kAskMeAgainLater";
+  }
+  return "Invalid";
+}
+
+}  // namespace chromeos_update_engine