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diff --git a/Solvers/VIATRA-Solver/org.eclipse.viatra.dse/src/org/eclipse/viatra/dse/visualizer/IDesignSpaceVisualizer.java b/Solvers/VIATRA-Solver/org.eclipse.viatra.dse/src/org/eclipse/viatra/dse/visualizer/IDesignSpaceVisualizer.java
new file mode 100644
index 00000000..da598b91
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+++ b/Solvers/VIATRA-Solver/org.eclipse.viatra.dse/src/org/eclipse/viatra/dse/visualizer/IDesignSpaceVisualizer.java
@@ -0,0 +1,39 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2014, Miklos Foldenyi, Andras Szabolcs Nagy, Abel Hegedus, Akos Horvath, Zoltan Ujhelyi and Daniel Varro
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-v20.html.
+ * 
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************/
+package org.eclipse.viatra.dse.visualizer;
+
+import org.eclipse.viatra.dse.api.DesignSpaceExplorer;
+import org.eclipse.viatra.dse.base.ThreadContext;
+
+/**
+ * 
+ * An implementation of this interface is notified about the traversal of the design space from every traversing thread,
+ * if registered to the {@link DesignSpaceExplorer}. Its purpose is to able to visualize the design space (a directed
+ * graph with IDs of the nodes and transitions) and to able to visualize the order of the exploration (the trace of a
+ * thread).
+ * 
+ * @author Andras Szabolcs Nagy
+ *
+ */
+public interface IDesignSpaceVisualizer extends IExploreEventHandler {
+
+    /**
+     * Initializes the instance with a starting thread's context. Can be called multiple times and concurrently.
+     * 
+     * @see DesignSpaceVisualizerOptions
+     * @param context
+     */
+    void init(ThreadContext context);
+
+    /**
+     * Saves the captured data.
+     */
+    void save();
+
+}