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diff --git a/runtime/org.argeo.slc.specs/src/main/java/org/argeo/slc/execution/ExecutionStep.java b/runtime/org.argeo.slc.specs/src/main/java/org/argeo/slc/execution/ExecutionStep.java
new file mode 100644
index 000000000..df2d805a8
--- /dev/null
+++ b/runtime/org.argeo.slc.specs/src/main/java/org/argeo/slc/execution/ExecutionStep.java
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2010 Mathieu Baudier <mbaudier@argeo.org>
+ *
+ * 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.execution;
+
+import java.io.Serializable;
+import java.util.Date;
+
+/**
+ * An atomic step to be notified in during an {@link ExecutionProcess}. Can be a
+ * log or the start/end of a phase, etc.
+ */
+public class ExecutionStep implements Serializable {
+	private static final long serialVersionUID = 798640526532912161L;
+
+	// public final static String START = "START";
+	// public final static String END = "END";
+	public final static String PHASE_START = "PHASE_START";
+	public final static String PHASE_END = "PHASE_END";
+	public final static String ERROR = "ERROR";
+	public final static String WARNING = "WARNING";
+	public final static String INFO = "INFO";
+	public final static String DEBUG = "DEBUG";
+	public final static String TRACE = "TRACE";
+
+	// TODO make the fields final and private when we don't need POJO support
+	// anymore (that
+	// is when SlcExecutionStep is removed)
+	protected String type;
+	protected String thread;
+	protected Date timestamp;
+	protected String log;
+
+	/** Empty constructor */
+	public ExecutionStep() {
+		thread = Thread.currentThread().getName();
+	}
+
+	/** Creates a step at the current date of type INFO */
+	public ExecutionStep(String log) {
+		this(new Date(), INFO, log);
+	}
+
+	/** Creates a step at the current date */
+	public ExecutionStep(String type, String log) {
+		this(new Date(), type, log);
+	}
+
+	/** Creates a step of the given type. */
+	public ExecutionStep(Date timestamp, String type, String log) {
+		this(timestamp, type, log, Thread.currentThread().getName());
+	}
+
+	public ExecutionStep(Date timestamp, String type, String log, String thread) {
+		this.type = type;
+		this.timestamp = timestamp;
+		this.thread = thread;
+		this.log = addLog(log);
+	}
+
+	public String getType() {
+		return type;
+	}
+
+	public Date getTimestamp() {
+		return timestamp;
+	}
+
+	public String getThread() {
+		return thread;
+	}
+
+	/**
+	 * Return the string that should be stored in the log field. Can be null if
+	 * another mechanism is used to store log lines.
+	 */
+	protected String addLog(String log) {
+		return log;
+	}
+
+	public String getLog() {
+		return log;
+	}
+
+	@Override
+	public String toString() {
+		return "Execution step, thread=" + thread + ", type=" + type;
+	}
+
+}