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diff --git a/runtime/org.argeo.slc.core/src/main/java/org/argeo/slc/core/execution/internal/ExecutionThread.java b/runtime/org.argeo.slc.core/src/main/java/org/argeo/slc/core/execution/internal/ExecutionThread.java
new file mode 100644
index 000000000..043f74bc7
--- /dev/null
+++ b/runtime/org.argeo.slc.core/src/main/java/org/argeo/slc/core/execution/internal/ExecutionThread.java
@@ -0,0 +1,66 @@
+package org.argeo.slc.core.execution.internal;
+
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+import org.argeo.slc.execution.ExecutionFlowDescriptor;
+import org.argeo.slc.process.RealizedFlow;
+import org.argeo.slc.process.SlcExecution;
+import org.argeo.slc.process.SlcExecutionNotifier;
+import org.argeo.slc.process.SlcExecutionStep;
+
+/** Thread of a single execution */
+public class ExecutionThread extends Thread {
+	private final static Log log = LogFactory.getLog(ExecutionThread.class);
+
+	private final RealizedFlow realizedFlow;
+	private final ProcessThread processThread;
+
+	public ExecutionThread(ProcessThread processThread,
+			RealizedFlow realizedFlow) {
+		super(processThread.getProcessThreadGroup(), "Flow "
+				+ realizedFlow.getFlowDescriptor().getName());
+		this.realizedFlow = realizedFlow;
+		this.processThread = processThread;
+	}
+
+	public void run() {
+		ExecutionFlowDescriptor executionFlowDescriptor = realizedFlow
+				.getFlowDescriptor();
+		String flowName = executionFlowDescriptor.getName();
+
+		dispatchAddStep(processThread.getSlcProcess(), new SlcExecutionStep(
+				SlcExecutionStep.TYPE_PHASE_START, "Flow " + flowName));
+
+		try {
+			processThread.getExecutionModulesManager().execute(realizedFlow);
+		} catch (Exception e) {
+			// TODO: re-throw exception ?
+			String msg = "Execution of flow " + flowName + " failed.";
+			log.error(msg, e);
+			dispatchAddStep(processThread.getSlcProcess(),
+					new SlcExecutionStep(msg + " " + e.getMessage()));
+		} finally {
+			processThread.flowCompleted();
+			dispatchAddStep(processThread.getSlcProcess(),
+					new SlcExecutionStep(SlcExecutionStep.TYPE_PHASE_END,
+							"Flow " + flowName));
+		}
+	}
+
+	protected void dispatchAddStep(SlcExecution slcExecution,
+			SlcExecutionStep step) {
+		slcExecution.getSteps().add(step);
+		List<SlcExecutionStep> steps = new ArrayList<SlcExecutionStep>();
+		steps.add(step);
+		for (Iterator<SlcExecutionNotifier> it = processThread
+				.getExecutionModulesManager().getSlcExecutionNotifiers()
+				.iterator(); it.hasNext();) {
+			it.next().addSteps(slcExecution, steps);
+		}
+	}
+
+}