diff --git a/pom.xml b/pom.xml
index 2f4130b..51f7847 100644
--- a/pom.xml
+++ b/pom.xml
@@ -33,6 +33,7 @@
 		<dependency>
 			<groupId>org.slf4j</groupId>
 			<artifactId>slf4j-api</artifactId>
+			<scope>provided</scope>
 		</dependency>
 		<dependency>
 			<groupId>com.thoughtworks.xstream</groupId>
diff --git a/src/main/java/org/gcube/vremanagement/executor/plugin/PluginStateEvolution.java b/src/main/java/org/gcube/vremanagement/executor/plugin/PluginStateEvolution.java
new file mode 100644
index 0000000..5a12b50
--- /dev/null
+++ b/src/main/java/org/gcube/vremanagement/executor/plugin/PluginStateEvolution.java
@@ -0,0 +1,37 @@
+/**
+ * 
+ */
+package org.gcube.vremanagement.executor.plugin;
+
+import java.util.UUID;
+
+/**
+ * @author Luca Frosini (ISTI - CNR) http://www.lucafrosini.com/
+ *
+ */
+public class PluginStateEvolution {
+
+	protected final UUID uuid;
+	protected final int iteration;
+	protected final long timestamp;
+	protected final PluginDeclaration pluginDeclaration;
+	protected final PluginState pluginState;
+	
+	/**
+	 * 
+	 * @param uuid the UUID which identify the current execution
+	 * @param timestamp the time of the new {@link PluginState}
+	 * @param pluginDeclaration the pluginDeclaration
+	 * @param pluginState the {@link PluginState} value
+	 * @throws Exception if fails
+	 */
+	public PluginStateEvolution(UUID uuid, int iteration, long timestamp,
+			PluginDeclaration pluginDeclaration, PluginState pluginState) {
+		this.uuid = uuid;
+		this.iteration = iteration;
+		this.timestamp = timestamp;
+		this.pluginDeclaration = pluginDeclaration;
+		this.pluginState = pluginState;
+	}
+	
+}
diff --git a/src/main/java/org/gcube/vremanagement/executor/plugin/PluginStateNotification.java b/src/main/java/org/gcube/vremanagement/executor/plugin/PluginStateNotification.java
index 13d068b..59da415 100644
--- a/src/main/java/org/gcube/vremanagement/executor/plugin/PluginStateNotification.java
+++ b/src/main/java/org/gcube/vremanagement/executor/plugin/PluginStateNotification.java
@@ -3,7 +3,6 @@
  */
 package org.gcube.vremanagement.executor.plugin;
 
-import java.util.UUID;
 
 /**
  * @author Luca Frosini (ISTI - CNR) http://www.lucafrosini.com/
@@ -11,16 +10,11 @@ import java.util.UUID;
  */
 public interface PluginStateNotification {
 
-	
 	/**
 	 * Persist the new state of plugin
-	 * @param uuid the UUID which identify the current execution
-	 * @param timestamp the time of the new {@link PluginState}
-	 * @param pluginDeclaration the pluginDeclaration
-	 * @param pluginState the {@link PluginState} value
+	 * @param pluginStateEvolution the PluginStateEvolution record to persist
 	 * @throws Exception if fails
 	 */
-	public abstract void pluginStateEvolution(UUID uuid, int lauchedtimes, 
-			long timestamp, String pluginName, PluginState pluginState) 
+	public abstract void pluginStateEvolution(PluginStateEvolution pluginStateEvolution) 
 			throws Exception;
 }