diff --git a/src/eva2/server/go/problems/AbstractOptimizationProblem.java b/src/eva2/server/go/problems/AbstractOptimizationProblem.java
index 4fedd21c..5adfeedb 100644
--- a/src/eva2/server/go/problems/AbstractOptimizationProblem.java
+++ b/src/eva2/server/go/problems/AbstractOptimizationProblem.java
@@ -465,7 +465,7 @@ implements InterfaceOptimizationProblem /*, InterfaceParamControllable*/, Serial
      * Refine a given individual using Nelder-Mead-Simplex local search. Return true, if the refined result is within a given
      * distance from the original individual in phenotype space. The maxEvaluations parameter gives the maximum evaluations
      * for the local search. Using the epsilonFitConv parameter one may define a convergence criterion as PhenotypeConvergenceTerminator 
-     * which is combined (using OR) with the evaluation counter.
+     * based on the given threshold and 100*dim evaluations, which is combined (using OR) with the evaluation counter.
      * If maxEvaluations is smaller than zero, a maximum of 500*dim evaluations is employed. 
      * Be aware that this may cost quite some runtime depending on the target
      * function.
diff --git a/src/eva2/server/go/problems/InterfaceHasSolutionViewer.java b/src/eva2/server/go/problems/InterfaceHasSolutionViewer.java
new file mode 100644
index 00000000..b8b7ac9a
--- /dev/null
+++ b/src/eva2/server/go/problems/InterfaceHasSolutionViewer.java
@@ -0,0 +1,11 @@
+package eva2.server.go.problems;
+
+/**
+ * An interface for problems which have a specific viewer.
+ * 
+ * @author mkron
+ *
+ */
+public interface InterfaceHasSolutionViewer {
+	public InterfaceSolutionViewer getSolutionViewer();
+}
diff --git a/src/eva2/server/go/problems/InterfaceSolutionViewer.java b/src/eva2/server/go/problems/InterfaceSolutionViewer.java
new file mode 100644
index 00000000..a31c213c
--- /dev/null
+++ b/src/eva2/server/go/problems/InterfaceSolutionViewer.java
@@ -0,0 +1,29 @@
+package eva2.server.go.problems;
+
+import eva2.server.go.populations.Population;
+
+/**
+ * A standard interface for solution viewers which display a single (best) solution
+ * or a population of solutions.
+ * 
+ * @author mkron
+ *
+ */
+public interface InterfaceSolutionViewer {
+	/**
+	 * Initialize the view for a certain problem.
+	 * @param prob
+	 */
+    public void initView(AbstractOptimizationProblem prob);
+    
+    /**
+     * Reset the view.
+     */
+    public void resetView();
+    
+    /**
+     * Update the view by displaying a population of solutions (often only the best one is shown).
+     * @param pop
+     */
+    public void updateView(Population pop, boolean showAllIfPossible);
+}