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diff --git a/org.argeo.slc.spring/src/org/argeo/slc/core/execution/InstantiationManager.java b/org.argeo.slc.spring/src/org/argeo/slc/core/execution/InstantiationManager.java
new file mode 100644
index 000000000..60e93ec15
--- /dev/null
+++ b/org.argeo.slc.spring/src/org/argeo/slc/core/execution/InstantiationManager.java
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2007-2012 Argeo GmbH
+ *
+ * Licensed 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.argeo.slc.core.execution;
+
+import java.util.Stack;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.argeo.slc.SlcException;
+import org.argeo.slc.execution.ExecutionFlow;
+import org.argeo.slc.execution.ExecutionSpecAttribute;
+
+/** Manage parameters that need to be set during the instantiation of a flow */
+public class InstantiationManager {
+
+	private final static Log log = LogFactory
+			.getLog(InstantiationManager.class);
+
+	private ThreadLocal<Stack<ExecutionFlow>> flowStack = new ThreadLocal<Stack<ExecutionFlow>>();
+
+	public Object createRef(String name) {
+
+		if ((flowStack.get() == null) || flowStack.get().empty()) {
+			throw new SlcException("No flow is currently initializing."
+					+ " Declare ParameterRef as inner beans or prototypes.");
+		}
+
+		return getInitializingFlowParameter(name);
+	}
+
+	public void flowInitializationStarted(ExecutionFlow flow, String flowName) {
+		// set the flow name if it is DefaultExecutionFlow
+		if (flow instanceof DefaultExecutionFlow) {
+			((DefaultExecutionFlow) flow).setBeanName(flowName);
+		}
+
+		if (log.isTraceEnabled())
+			log.trace("Start initialization of " + flow.hashCode() + " ("
+					+ flow + " - " + flow.getClass() + ")");
+
+		// log.info("# flowInitializationStarted " + flowName);
+		// create a stack for this thread if there is none
+		if (flowStack.get() == null) {
+			flowStack.set(new Stack<ExecutionFlow>());
+		}
+		flowStack.get().push(flow);
+	}
+
+	public void flowInitializationFinished(ExecutionFlow flow, String flowName) {
+		if (log.isTraceEnabled())
+			log.trace("Finish initialization of " + flow.hashCode() + " ("
+					+ flow + " - " + flow.getClass() + ")");
+
+		if (flowStack.get() != null) {
+			ExecutionFlow registeredFlow = flowStack.get().pop();
+			if (registeredFlow != null) {
+				if (!flow.getName().equals(registeredFlow.getName()))
+					throw new SlcException("Current flow is " + flow);
+				// log.info("# flowInitializationFinished " + flowName);
+				// initializingFlow.set(null);
+			}
+		} else {
+			// happens for flows imported as services
+			log.warn("flowInitializationFinished - Flow Stack is null");
+		}
+	}
+
+	protected ExecutionFlow findInitializingFlowWithParameter(String key) {
+		if ((flowStack.get() == null) || flowStack.get().empty())
+			throw new SlcException("No initializing flow available.");
+
+		// first look in the outer flow (that may override parameters)
+		for (int i = 0; i < flowStack.get().size(); i++) {
+			if (flowStack.get().elementAt(i).isSetAsParameter(key)) {
+				return flowStack.get().elementAt(i);
+			}
+		}
+		throw new SlcException("Key " + key + " is not set as parameter in "
+				+ flowStack.get().firstElement().toString() + " (stack size="
+				+ flowStack.get().size() + ")");
+
+	}
+
+	public Object getInitializingFlowParameter(String key) {
+		return findInitializingFlowWithParameter(key).getParameter(key);
+	}
+
+	public Class<?> getInitializingFlowParameterClass(String key) {
+		ExecutionSpecAttribute attr = findInitializingFlowWithParameter(key)
+				.getExecutionSpec().getAttributes().get(key);
+		if (attr instanceof RefSpecAttribute)
+			return ((RefSpecAttribute) attr).getTargetClass();
+		else if (attr instanceof PrimitiveSpecAttribute) {
+			String type = ((PrimitiveSpecAttribute) attr).getType();
+			Class<?> clss = PrimitiveUtils.typeAsClass(type);
+			if (clss == null)
+				throw new SlcException("Cannot convert type " + type
+						+ " to class.");
+			return clss;
+		} else
+			return null;
+	}
+
+	public Boolean isInFlowInitialization() {
+		return (flowStack.get() != null) && !flowStack.get().empty();
+	}
+}