diff --git a/app/src/main/java/org/cutem/cutecalendar/model/TodoItem.java b/app/src/main/java/org/cutem/cutecalendar/model/TodoItem.java
index 7df313e..95d0cb9 100644
--- a/app/src/main/java/org/cutem/cutecalendar/model/TodoItem.java
+++ b/app/src/main/java/org/cutem/cutecalendar/model/TodoItem.java
@@ -271,7 +271,7 @@ public class TodoItem {
      * @return the title property value if any; {@code null} otherwise
      */
     public String getTitle() {
-        return mStringProperties.getOrDefault(TITLE, null);
+        return getStringProperty(TITLE);
     }
 
     /**
@@ -280,7 +280,7 @@ public class TodoItem {
      * @return the location property value if any; {@code null} otherwise
      */
     public String getLocation() {
-        return mStringProperties.getOrDefault(LOCATION, null);
+        return getStringProperty(LOCATION);
     }
 
     /**
@@ -289,7 +289,7 @@ public class TodoItem {
      * @return the description property value if any; {@code null} otherwise
      */
     public String getDescription() {
-        return mStringProperties.getOrDefault(DESCRIPTION, null);
+        return getStringProperty(DESCRIPTION);
     }
 
     /**
diff --git a/app/src/main/java/org/cutem/cutecalendar/model/TodoItemManager.java b/app/src/main/java/org/cutem/cutecalendar/model/TodoItemManager.java
index 96736e8..a63fc58 100644
--- a/app/src/main/java/org/cutem/cutecalendar/model/TodoItemManager.java
+++ b/app/src/main/java/org/cutem/cutecalendar/model/TodoItemManager.java
@@ -83,6 +83,10 @@ public class TodoItemManager {
         return mIdCache.getOrDefault(id, null);
     }
 
+    public Set<TodoItem> getItems() {
+        return mUnmodifiableItems;
+    }
+
     public List<TodoItem> queryTodoItemsDuring(@NotNull Calendar from, @NotNull Calendar to) {
         ArrayList<TodoItem> result = new ArrayList<>();
         for (TodoItem i : mItems) {
diff --git a/app/src/main/java/org/cutem/cutecalendar/model/TodoItemUtil.java b/app/src/main/java/org/cutem/cutecalendar/model/TodoItemUtil.java
index e43a2ef..5af62f8 100644
--- a/app/src/main/java/org/cutem/cutecalendar/model/TodoItemUtil.java
+++ b/app/src/main/java/org/cutem/cutecalendar/model/TodoItemUtil.java
@@ -131,7 +131,10 @@ public class TodoItemUtil {
         } else if (i2.getType() == ANNIVERSARY) {
             return isIntersectedWithAnniversary(i2, i1);
         } else {
-            return isIntersected(calculateRepeatArray(i1), calculateRepeatArray(i2));
+            List<GenericPair<Calendar, Calendar>> ints1 = calculateRepeatArray(i1);
+            List<GenericPair<Calendar, Calendar>> ints2 = calculateRepeatArray(i2);
+
+            return isIntersected(ints1, ints2);
         }
     }
 
@@ -153,10 +156,10 @@ public class TodoItemUtil {
     }
 
     public static boolean isIn(
-            @NotNull Collection<GenericPair<Calendar, Calendar>> l1,
-            @NotNull Collection<GenericPair<Calendar, Calendar>> l2) {
-        for (GenericPair<Calendar, Calendar> p1 : l1) {
-            for (GenericPair<Calendar, Calendar> p2 : l2) {
+            @NotNull Collection<GenericPair<Calendar, Calendar>> outInts,
+            @NotNull Collection<GenericPair<Calendar, Calendar>> inInts) {
+        for (GenericPair<Calendar, Calendar> p1 : outInts) {
+            for (GenericPair<Calendar, Calendar> p2 : inInts) {
                 Calendar c1 = p1.getFirst();
                 Calendar c2 = p1.getSecond();
                 Calendar c3 = p2.getFirst();
@@ -200,9 +203,7 @@ public class TodoItemUtil {
             @NotNull TodoItem anniversary,
             @NotNull TodoItem item) {
         if (item.getType() == ANNIVERSARY && anniversary.getBgn().after(item.getBgn())) {
-            TodoItem t = anniversary;
-            anniversary = item;
-            item = t;
+            return false;
         }
 
         List<GenericPair<Calendar, Calendar>> list = calculateRepeatArray(item);
@@ -221,13 +222,15 @@ public class TodoItemUtil {
         }
     }
 
-    public static boolean isIn(@NotNull TodoItem i1, @NotNull TodoItem i2) {
-        if (i1.getType() == ANNIVERSARY) {
-            return isInAnniversary(i1, i2);
-        } else if (i2.getType() == ANNIVERSARY) {
-            return isInAnniversary(i2, i1);
+    public static boolean isIn(@NotNull TodoItem outItem, @NotNull TodoItem inItem) {
+        if (outItem.getType() == ANNIVERSARY) {
+            return isInAnniversary(outItem, inItem);
+        } else if (inItem.getType() == ANNIVERSARY) {
+            return false;
         } else {
-            return isIn(calculateRepeatArray(i1), calculateRepeatArray(i2));
+            List<GenericPair<Calendar, Calendar>> ints1 = calculateRepeatArray(outItem);
+            List<GenericPair<Calendar, Calendar>> ints2 = calculateRepeatArray(inItem);
+            return isIn(ints1, ints2);
         }
     }
 
@@ -236,7 +239,8 @@ public class TodoItemUtil {
         int pType = parent.getType();
         int cType = child.getType();
 
-        return pType != cType && arrayContains(PARENT_CHILDREN_CONFLICT, pType)
+        return pType != cType
+                && arrayContains(PARENT_CHILDREN_CONFLICT, pType)
                 && arrayContains(PARENT_CHILDREN_CONFLICT, cType)
                 && isIn(parent, child);
     }
@@ -254,6 +258,10 @@ public class TodoItemUtil {
         return result;
     }
 
+    public static boolean haveParent(@NotNull TodoItem item) {
+        return getParentId(item) != item.getId();
+    }
+
     public static long getParentId(@NotNull TodoItem item) {
         String id = item.getStringProperty(PARENT_ID);
         return id == null ? item.getId() : Long.parseLong(id);
@@ -274,6 +282,7 @@ public class TodoItemUtil {
         return builder.toString();
     }
 
+
     public static TodoItem[] bind(@NotNull TodoItem parent, @NotNull TodoItem child) {
         TodoItemFactory fParent = new TodoItemFactory().copy(parent);
         TodoItemFactory fChild = new TodoItemFactory().copy(child);
@@ -315,6 +324,7 @@ public class TodoItemUtil {
         return new TodoItem[]{newP, newC};
     }
 
+
     public static TodoItem finishSingleTodoItem(@NotNull TodoItem item) {
         TodoItemFactory factory = new TodoItemFactory();
         return factory.copy(item).stringProperties(FINISH, "finish").buildId(item.getId());
@@ -328,4 +338,38 @@ public class TodoItemUtil {
                 .build();
     }
 
+
+    public static boolean isFinished(@NotNull TodoItem item) {
+        if (item.getStringProperty(FINISH) != null) {
+            return true;
+        } else {
+            List<Long> ids = getAllChildrenIds(item);
+            if (ids.isEmpty()) { // leaf
+                return false;
+            } else {
+                for (long id : ids) {
+                    TodoItem childItem = TodoItemManager.getInstance().get(id);
+                    if (childItem != null && !isFinished(childItem)) {
+                        return false;
+                    }
+                }
+                return true;
+            }
+        }
+    }
+
+    public static boolean isBeforeStart(@NotNull TodoItem item) {
+        Calendar now = Calendar.getInstance();
+        return now.before(item.getBgn());
+    }
+
+    public static boolean isEnded(@NotNull TodoItem item) {
+        Calendar now = Calendar.getInstance();
+        return now.after(item.getEnd());
+    }
+
+    public static boolean isRunning(@NotNull TodoItem item) {
+        return !isBeforeStart(item) && !isEnded(item);
+    }
+
 }