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diff --git a/sca-cpp/trunk/modules/eval/driver.hpp b/sca-cpp/trunk/modules/eval/driver.hpp
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index 0000000000..4c69ecb0a1
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+++ b/sca-cpp/trunk/modules/eval/driver.hpp
@@ -0,0 +1,77 @@
+/*
+ * 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.
+ */
+
+/* $Rev$ $Date$ */
+
+#ifndef tuscany_eval_driver_hpp
+#define tuscany_eval_driver_hpp
+
+/**
+ * Script evaluator main driver loop.
+ */
+
+#include <string>
+#include <iostream>
+#include "eval.hpp"
+
+namespace tuscany {
+namespace eval {
+
+const std::string evalOutputPrompt("; ");
+const std::string evalInputPrompt("=> ");
+
+const bool promptForInput(const std::string str, std::ostream& out) {
+    out << "\n\n" << str;
+    return true;
+}
+
+const bool announceOutput(const std::string str, std::ostream& out) {
+    out << "\n" << str;
+    return true;
+}
+
+const bool userPrint(const value val, std::ostream& out) {
+    if(isCompoundProcedure(val))
+        writeValue(mklist<value>(compoundProcedureSymbol, procedureParameters(val), procedureBody(val), "<procedure-env>"), out);
+    writeValue(val, out);
+    return true;
+}
+
+const value evalDriverLoop(std::istream& in, std::ostream& out, Env& globalEnv, const gc_pool& pool) {
+    promptForInput(evalInputPrompt, out);
+    value input = readValue(in);
+    if (isNil(input))
+        return input;
+    const value output = evalExpr(input, globalEnv, pool);
+    announceOutput(evalOutputPrompt, out);
+    userPrint(output, out);
+    return evalDriverLoop(in, out, globalEnv, pool);
+}
+
+const bool evalDriverRun(std::istream& in, std::ostream& out) {
+    gc_pool pool;
+    setupDisplay(out);
+    Env globalEnv = setupEnvironment(pool);
+    evalDriverLoop(in, out, globalEnv, pool);
+    return true;
+}
+
+}
+}
+#endif /* tuscany_eval_driver_hpp */