diff --git a/java/src/com/android/inputmethod/latin/Dictionary.java b/java/src/com/android/inputmethod/latin/Dictionary.java
index acd7c2a..7c3e4a7 100644
--- a/java/src/com/android/inputmethod/latin/Dictionary.java
+++ b/java/src/com/android/inputmethod/latin/Dictionary.java
@@ -35,8 +35,13 @@
     public static final String TYPE_CONTACTS = "contacts";
     // User dictionary, the system-managed one.
     public static final String TYPE_USER = "user";
-    // User history dictionary internal to LatinIME.
+    // User history dictionary internal to LatinIME. This assumes bigram prediction for now.
     public static final String TYPE_USER_HISTORY = "history";
+    // Personalization binary dictionary internal to LatinIME.
+    public static final String TYPE_PERSONALIZATION = "personalization";
+    // Personalization prediction dictionary internal to LatinIME's Java code.
+    public static final String TYPE_PERSONALIZATION_PREDICTION_IN_JAVA =
+            "personalization_prediction_in_java";
     // Spawned by resuming suggestions. Comes from a span that was in the TextView.
     public static final String TYPE_RESUMED = "resumed";
     protected final String mDictType;
diff --git a/java/src/com/android/inputmethod/latin/personalization/PersonalizationDicitonary.java b/java/src/com/android/inputmethod/latin/personalization/PersonalizationDicitonary.java
new file mode 100644
index 0000000..d3e2dfe
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/personalization/PersonalizationDicitonary.java
@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin.personalization;
+
+import com.android.inputmethod.latin.Dictionary;
+import com.android.inputmethod.latin.ExpandableBinaryDictionary;
+
+import android.content.Context;
+
+/**
+ * This class is a dictionary for the personalized language model that uses binary dictionary.
+ */
+public class PersonalizationDicitonary extends ExpandableBinaryDictionary {
+    private static final String NAME = "personalization";
+
+    public static void registerUpdateListener(PersonalizationDictionaryUpdateListener listener) {
+        // TODO: Implement
+    }
+
+    /** Locale for which this user history dictionary is storing words */
+    private final String mLocale;
+
+    // Singleton
+    private PersonalizationDicitonary(final Context context, final String locale) {
+        super(context, getFilenameWithLocale(NAME, locale), Dictionary.TYPE_PERSONALIZATION);
+        mLocale = locale;
+    }
+
+    @Override
+    protected void loadDictionaryAsync() {
+        // TODO: Implement
+    }
+
+    @Override
+    protected boolean hasContentChanged() {
+        // TODO: Implement
+        return false;
+    }
+
+    @Override
+    protected boolean needsToReloadBeforeWriting() {
+        // TODO: Implement
+        return false;
+    }
+
+    // TODO: Implement
+}
diff --git a/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionaryUpdateListener.java b/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionaryUpdateListener.java
new file mode 100644
index 0000000..2ec0dc0
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/personalization/PersonalizationDictionaryUpdateListener.java
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin.personalization;
+
+public class PersonalizationDictionaryUpdateListener {
+    // TODO: Implement
+}
diff --git a/java/src/com/android/inputmethod/latin/personalization/PersonalizationPredictionDicitonary.java b/java/src/com/android/inputmethod/latin/personalization/PersonalizationPredictionDicitonary.java
new file mode 100644
index 0000000..3e77725
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/personalization/PersonalizationPredictionDicitonary.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin.personalization;
+
+import com.android.inputmethod.latin.Dictionary;
+import com.android.inputmethod.latin.ExpandableDictionary;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+
+/**
+ * This class is a dictionary for the personalized prediction language model implemented in Java.
+ */
+public class PersonalizationPredictionDicitonary extends ExpandableDictionary {
+    public static void registerUpdateListener(PersonalizationDictionaryUpdateListener listener) {
+        // TODO: Implement
+    }
+
+    /** Locale for which this user history dictionary is storing words */
+    private final String mLocale;
+    private final SharedPreferences mPrefs;
+
+    // Singleton
+    private PersonalizationPredictionDicitonary(final Context context, final String locale,
+            final SharedPreferences sp) {
+        super(context, Dictionary.TYPE_PERSONALIZATION_PREDICTION_IN_JAVA);
+        mLocale = locale;
+        mPrefs = sp;
+    }
+
+    // TODO: Implement
+}
diff --git a/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionary.java b/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionary.java
index a5d6f04..a8f1a9e 100644
--- a/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionary.java
@@ -53,7 +53,7 @@
  * Locally gathers stats about the words user types and various other signals like auto-correction
  * cancellation or manual picks. This allows the keyboard to adapt to the typist over time.
  */
-public final class UserHistoryDictionary extends ExpandableDictionary {
+public class UserHistoryDictionary extends ExpandableDictionary {
     private static final String TAG = UserHistoryDictionary.class.getSimpleName();
     private static final String NAME = UserHistoryDictionary.class.getSimpleName();
     public static final boolean DBG_SAVE_RESTORE = false;