Index: branches/ALPS/HeuristicLab.Operators/3.3/HeuristicLab.Operators-3.3.csproj
===================================================================
--- branches/ALPS/HeuristicLab.Operators/3.3/HeuristicLab.Operators-3.3.csproj	(revision 11531)
+++ branches/ALPS/HeuristicLab.Operators/3.3/HeuristicLab.Operators-3.3.csproj	(revision 11558)
@@ -124,4 +124,5 @@
     <Compile Include="MultiOperator.cs" />
     <Compile Include="Operator.cs" />
+    <Compile Include="OptionalSubScopesProcessor.cs" />
     <Compile Include="Placeholder.cs" />
     <Compile Include="IntCounter.cs" />
Index: branches/ALPS/HeuristicLab.Operators/3.3/OptionalSubScopesProcessor.cs
===================================================================
--- branches/ALPS/HeuristicLab.Operators/3.3/OptionalSubScopesProcessor.cs	(revision 11558)
+++ branches/ALPS/HeuristicLab.Operators/3.3/OptionalSubScopesProcessor.cs	(revision 11558)
@@ -0,0 +1,95 @@
+﻿#region License Information
+/* HeuristicLab
+ * Copyright (C) 2002-2014 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
+ *
+ * This file is part of HeuristicLab.
+ *
+ * HeuristicLab is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * HeuristicLab is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
+ */
+#endregion
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using HeuristicLab.Common;
+using HeuristicLab.Core;
+using HeuristicLab.Data;
+using HeuristicLab.Parameters;
+using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
+
+namespace HeuristicLab.Operators {
+  /// <summary>
+  /// An operator which contains multiple operators of which each is applied on one sub-scope at the given depth of the current scope. The first operator is applied on the first sub-scope, the second on the second, and so on.
+  /// </summary>
+  [Item("OptionalSubScopesProcessor", "An operator which contains multiple operators of which each is applied on one sub-scope at the given depth of the current scope. The first operator is applied on the first sub-scope, the second on the second, and so on.")]
+  [StorableClass]
+  public sealed class OptionalSubScopesProcessor : MultiOperator<IOperator> {
+    public ValueLookupParameter<BoolValue> ParallelParameter {
+      get { return (ValueLookupParameter<BoolValue>)Parameters["Parallel"]; }
+    }
+    public ValueParameter<IntValue> DepthParameter {
+      get { return (ValueParameter<IntValue>)Parameters["Depth"]; }
+    }
+
+    public BoolValue Parallel {
+      get { return ParallelParameter.Value; }
+      set { ParallelParameter.Value = value; }
+    }
+    public IntValue Depth {
+      get { return DepthParameter.Value; }
+      set { DepthParameter.Value = value; }
+    }
+
+    [StorableConstructor]
+    private OptionalSubScopesProcessor(bool deserializing) : base(deserializing) { }
+    private OptionalSubScopesProcessor(OptionalSubScopesProcessor original, Cloner cloner)
+      : base(original, cloner) {
+    }
+    public OptionalSubScopesProcessor()
+      : base() {
+      Parameters.Add(new ValueLookupParameter<BoolValue>("Parallel", "True if the operators should be applied in parallel on the sub-scopes, otherwise false.", new BoolValue(false)));
+      Parameters.Add(new ValueParameter<IntValue>("Depth", "The number of steps to descend in the scope tree before applying operator.", new IntValue(1)));
+    }
+
+    public override IDeepCloneable Clone(Cloner cloner) {
+      return new OptionalSubScopesProcessor(this, cloner);
+    }
+
+    public override IOperation InstrumentedApply() {
+
+      List<IScope> scopes = GetScopesOnLevel(ExecutionContext.Scope, Depth.Value).ToList();
+      OperationCollection next = new OperationCollection(base.InstrumentedApply());
+      //if (scopes.Count < Operators.Count)
+      //  throw new ArgumentException("The number of operators doesn't match the number of sub-scopes at depth " + Depth.Value);
+      OperationCollection inner = new OperationCollection();
+      inner.Parallel = Parallel == null ? false : Parallel.Value;
+      for (int i = 0; i < scopes.Count() && i < Operators.Count; i++) {
+        inner.Add(ExecutionContext.CreateOperation(Operators[i], scopes[i]));
+      }
+      next.Insert(0, inner);
+      return next;
+    }
+
+    private IEnumerable<IScope> GetScopesOnLevel(IScope scope, int d) {
+      if (d == 0) yield return scope;
+      else {
+        foreach (IScope subScope in scope.SubScopes) {
+          foreach (IScope scopesOfSubScope in GetScopesOnLevel(subScope, d - 1)) {
+            yield return scopesOfSubScope;
+          }
+        }
+      }
+    }
+  }
+}
