diff --git a/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/AggregatedHoursGroup.java b/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/AggregatedHoursGroup.java
index e388b9de3..6731360e1 100644
--- a/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/AggregatedHoursGroup.java
+++ b/navalplanner-business/src/main/java/org/navalplanner/business/orders/entities/AggregatedHoursGroup.java
@@ -29,6 +29,7 @@ import java.util.Map;
 import java.util.Set;
 import java.util.Map.Entry;
 
+import org.apache.commons.lang.StringUtils;
 import org.navalplanner.business.resources.entities.Criterion;
 
 /**
@@ -52,6 +53,14 @@ public class AggregatedHoursGroup {
         return result;
     }
 
+    public static int sum(Collection<? extends AggregatedHoursGroup> aggregated) {
+        int result = 0;
+        for (AggregatedHoursGroup each : aggregated) {
+            result += each.getHours();
+        }
+        return result;
+    }
+
     private static Map<Set<Criterion>, List<HoursGroup>> byCriterions(
             Collection<? extends HoursGroup> hours) {
         Map<Set<Criterion>, List<HoursGroup>> result = new HashMap<Set<Criterion>, List<HoursGroup>>();
@@ -83,4 +92,26 @@ public class AggregatedHoursGroup {
         return hoursGroup;
     }
 
+    public int getHours() {
+        int result = 0;
+        for (HoursGroup each : hoursGroup) {
+            result += each.getWorkingHours();
+        }
+        return result;
+    }
+
+    public String getCriterionsJoinedByComma() {
+        List<String> criterionNames = asNames(criterions);
+        Collections.sort(criterionNames);
+        return StringUtils.join(criterionNames, ", ");
+    }
+
+    private List<String> asNames(Set<Criterion> criterions) {
+        List<String> result = new ArrayList<String>();
+        for (Criterion each : criterions) {
+            result.add(each.getName());
+        }
+        return result;
+    }
+
 }
diff --git a/navalplanner-business/src/test/java/org/navalplanner/business/test/orders/entities/AggregatedHoursGroupTest.java b/navalplanner-business/src/test/java/org/navalplanner/business/test/orders/entities/AggregatedHoursGroupTest.java
index 33443b516..4bf4b893f 100644
--- a/navalplanner-business/src/test/java/org/navalplanner/business/test/orders/entities/AggregatedHoursGroupTest.java
+++ b/navalplanner-business/src/test/java/org/navalplanner/business/test/orders/entities/AggregatedHoursGroupTest.java
@@ -48,13 +48,11 @@ public class AggregatedHoursGroupTest {
 
     private Criterion criterion1;
     private Criterion criterion2;
-    private Criterion criterion3;
 
     @Before
     public void setUpCriterions() {
         criterion1 = createNiceMock(Criterion.class);
         criterion2 = createNiceMock(Criterion.class);
-        criterion3 = createNiceMock(Criterion.class);
     }
 
     @Test
@@ -76,6 +74,27 @@ public class AggregatedHoursGroupTest {
                 withHours(h4, h5))));
     }
 
+    @Test
+    public void getHoursReturnTheSumOfAllHours() {
+        HoursGroup h1 = createHoursGroupWithCriterions(criterion1, criterion2);
+        h1.setWorkingHours(10);
+        HoursGroup h2 = createHoursGroupWithCriterions(criterion1, criterion2);
+        h2.setWorkingHours(5);
+        AggregatedHoursGroup aggregate = AggregatedHoursGroup.aggregate(h1, h2)
+                .get(0);
+        assertThat(aggregate.getHours(), equalTo(15));
+    }
+
+    @Test
+    public void sumAllAggregatedHours() {
+        HoursGroup h1 = createHoursGroupWithCriterions(criterion1, criterion2);
+        h1.setWorkingHours(10);
+        HoursGroup h2 = createHoursGroupWithCriterions(criterion1);
+        h2.setWorkingHours(5);
+        List<AggregatedHoursGroup> list = AggregatedHoursGroup.aggregate(h1, h2);
+        assertThat(AggregatedHoursGroup.sum(list), equalTo(15));
+    }
+
     private static abstract class AggregatedHoursGroupMatcher extends
             BaseMatcher<AggregatedHoursGroup> {