diff --git a/api/src/com/todoroo/astrid/data/TagData.java b/api/src/com/todoroo/astrid/data/TagData.java
index 901bdc7b3..d0a938209 100644
--- a/api/src/com/todoroo/astrid/data/TagData.java
+++ b/api/src/com/todoroo/astrid/data/TagData.java
@@ -33,7 +33,7 @@ public final class TagData extends RemoteModel {
     public static final Table TABLE = new Table("tagdata", TagData.class);
 
     /** model class for entries in the outstanding table */
-    public static final Class<? extends AbstractModel> OUTSTANDING_MODEL = TagOutstanding.class;
+    public static final Class<? extends OutstandingEntry<TagData>> OUTSTANDING_MODEL = TagOutstanding.class;
 
     /** content uri for this model */
     public static final Uri CONTENT_URI = Uri.parse("content://" + AstridApiConstants.PACKAGE + "/" +
diff --git a/api/src/com/todoroo/astrid/data/Task.java b/api/src/com/todoroo/astrid/data/Task.java
index e08072a23..8358e3d3c 100644
--- a/api/src/com/todoroo/astrid/data/Task.java
+++ b/api/src/com/todoroo/astrid/data/Task.java
@@ -38,7 +38,7 @@ public final class Task extends RemoteModel {
     public static final Table TABLE = new Table("tasks", Task.class);
 
     /** model class for entries in the outstanding table */
-    public static final Class<? extends AbstractModel> OUTSTANDING_MODEL = TaskOutstanding.class;
+    public static final Class<? extends OutstandingEntry<Task>> OUTSTANDING_MODEL = TaskOutstanding.class;
 
     /** content uri for this model */
     public static final Uri CONTENT_URI = Uri.parse("content://" + AstridApiConstants.PACKAGE + "/" +
diff --git a/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/BriefMe.java b/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/BriefMe.java
index adaea272d..f1de7608c 100644
--- a/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/BriefMe.java
+++ b/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/BriefMe.java
@@ -1,5 +1,20 @@
 package com.todoroo.astrid.actfm.sync.messages;
 
-public class BriefMe implements ClientToServerMessage {
+import com.todoroo.astrid.data.RemoteModel;
+
+public class BriefMe<TYPE extends RemoteModel> implements ClientToServerMessage {
+
+    private final Class<? extends RemoteModel> modelClass;
+    private final long uuid;
+    private long pushedAt; // TODO: Populate and use
+
+    public BriefMe(TYPE entity) {
+        this.modelClass = entity.getClass();
+        this.uuid = entity.getValue(RemoteModel.REMOTE_ID_PROPERTY);
+    }
+
+    public void send() {
+        // Send message
+    }
 
 }
diff --git a/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/ChangesHappened.java b/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/ChangesHappened.java
index b16dbf56c..57e5a0ae7 100644
--- a/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/ChangesHappened.java
+++ b/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/ChangesHappened.java
@@ -1,24 +1,109 @@
 package com.todoroo.astrid.actfm.sync.messages;
 
+import java.lang.reflect.Field;
 import java.util.ArrayList;
 import java.util.List;
 
+import android.util.Log;
+
+import com.todoroo.andlib.data.AbstractModel;
+import com.todoroo.andlib.data.Property;
+import com.todoroo.andlib.data.TodorooCursor;
+import com.todoroo.andlib.sql.Order;
+import com.todoroo.andlib.sql.Query;
+import com.todoroo.astrid.dao.OutstandingEntryDao;
 import com.todoroo.astrid.data.OutstandingEntry;
 import com.todoroo.astrid.data.RemoteModel;
 
+@SuppressWarnings("nls")
 public class ChangesHappened<TYPE extends RemoteModel> implements ClientToServerMessage {
 
     private final Class<? extends RemoteModel> modelClass;
+    private final Class<? extends OutstandingEntry<TYPE>> outstandingClass;
+    private final Property<?>[] outstandingProperties;
     private final long id;
     private final long uuid;
-    private final List<OutstandingEntry<TYPE>> changes;
-    private long pushedAt;
+    private final List<Change> changes;
+    private long pushedAt; // TODO: Populate and use
+    private final OutstandingEntryDao<OutstandingEntry<TYPE>> dao;
 
-    public ChangesHappened(TYPE entity) {
+    public ChangesHappened(TYPE entity, OutstandingEntryDao<OutstandingEntry<TYPE>> dao) {
         this.modelClass = entity.getClass();
+        this.outstandingClass = getOutstandingClass(modelClass);
+        this.outstandingProperties = getModelProperties(outstandingClass);
         this.id = entity.getId();
         this.uuid = entity.getValue(RemoteModel.REMOTE_ID_PROPERTY);
-        this.changes = new ArrayList<OutstandingEntry<TYPE>>();
+        this.changes = new ArrayList<Change>();
+        this.dao = dao;
+        populateChanges();
+    }
+
+    public void send() {
+        // Process changes list and send to server
+    }
+
+    private class Change {
+        public final long uuid;
+        public final OutstandingEntry<TYPE> outstandingEntry;
+
+        public Change(long uuid, OutstandingEntry<TYPE> outstandingEntry) {
+            this.uuid = uuid;
+            this.outstandingEntry = outstandingEntry;
+        }
+    }
+
+    private void populateChanges() {
+        TodorooCursor<OutstandingEntry<TYPE>> cursor = dao.query(Query.select(outstandingProperties)
+               .where(OutstandingEntry.ENTITY_ID_PROPERTY.eq(id)).orderBy(Order.asc(OutstandingEntry.CREATED_AT_PROPERTY)));
+        try {
+            for (cursor.moveToFirst(); !cursor.isAfterLast(); cursor.moveToNext()) {
+                try {
+                    OutstandingEntry<TYPE> instance = outstandingClass.newInstance();
+                    instance.readPropertiesFromCursor(cursor);
+                    changes.add(new Change(uuid, instance));
+                } catch (IllegalAccessException e) {
+                    Log.e("ChangesHappened", "Error instantiating outstanding model class", e);
+                } catch (InstantiationException e2) {
+                    Log.e("ChangesHappened", "Error instantiating outstanding model class", e2);
+                }
+            }
+        } finally {
+            cursor.close();
+        }
+    }
+
+    private Class<? extends OutstandingEntry<TYPE>> getOutstandingClass(Class<? extends RemoteModel> model) {
+        try {
+            Field outstandingField = model.getField("OUTSTANDING_MODEL");
+            Class<? extends OutstandingEntry<TYPE>> outstanding = (Class<? extends OutstandingEntry<TYPE>>) outstandingField.get(null);
+            if (outstanding == null) {
+                throw new RuntimeException("OUTSTANDING_MODEL field for class " + model.getName() + " is null");
+            }
+            return outstanding;
+        } catch (NoSuchFieldException e) {
+            throw new RuntimeException("Class " + model.getName() + " does not declare an OUTSTANDING_MODEL field");
+        } catch (IllegalAccessException e2) {
+            throw new RuntimeException("OUTSTANDING_MODEL field for class " + model.getName() + " is not accessible");
+        } catch (ClassCastException e3) {
+            throw new RuntimeException("OUTSTANDING_MODEL field for class " + model.getName() + " is not of the correct type");
+        }
+    }
+
+    private Property<?>[] getModelProperties(Class<? extends AbstractModel> model) {
+        try {
+            Field propertiesField = model.getField("PROPERTIES");
+            Property<?>[] properties = (Property<?>[]) propertiesField.get(null);
+            if (properties == null) {
+                throw new RuntimeException("PROPERTIES field for class " + model.getName() + " is null");
+            }
+            return properties;
+        } catch (NoSuchFieldException e) {
+            throw new RuntimeException("Class " + model.getName() + " does not declare an PROPERTIES field");
+        } catch (IllegalAccessException e2) {
+            throw new RuntimeException("PROPERTIES field for class " + model.getName() + " is not accessible");
+        } catch (ClassCastException e3) {
+            throw new RuntimeException("PROPERTIES field for class " + model.getName() + " is not of the correct type");
+        }
     }
 
 }
diff --git a/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/ClientToServerMessage.java b/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/ClientToServerMessage.java
index 4db6263ed..bf972dca8 100644
--- a/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/ClientToServerMessage.java
+++ b/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/ClientToServerMessage.java
@@ -2,4 +2,6 @@ package com.todoroo.astrid.actfm.sync.messages;
 
 public interface ClientToServerMessage {
 
+    public void send();
+
 }
diff --git a/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/RequestDoubleCheck.java b/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/RequestDoubleCheck.java
index 6cf82d5a1..d95d0d673 100644
--- a/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/RequestDoubleCheck.java
+++ b/astrid/plugin-src/com/todoroo/astrid/actfm/sync/messages/RequestDoubleCheck.java
@@ -1,5 +1,18 @@
 package com.todoroo.astrid.actfm.sync.messages;
 
-public class RequestDoubleCheck implements ClientToServerMessage {
+import com.todoroo.astrid.data.RemoteModel;
 
+public class RequestDoubleCheck<TYPE extends RemoteModel> implements ClientToServerMessage {
+
+    private final Class<? extends RemoteModel> modelClass;
+    private final long uuid;
+
+    public RequestDoubleCheck(TYPE entity) {
+        this.modelClass = entity.getClass();
+        this.uuid = entity.getValue(RemoteModel.REMOTE_ID_PROPERTY);
+    }
+
+    public void send() {
+        // Send message
+    }
 }