diff --git a/app/src/main/java/fr/romanet/vj/apps/myweather/ICityService.java b/app/src/main/java/fr/romanet/vj/apps/myweather/ICityService.java
new file mode 100644
index 0000000..5fa52d2
--- /dev/null
+++ b/app/src/main/java/fr/romanet/vj/apps/myweather/ICityService.java
@@ -0,0 +1,32 @@
+package fr.romanet.vj.apps.myweather;
+
+import java.util.List;
+import fr.romanet.vj.apps.myweather.bo.City;
+
+//Interface used in order to implement correctly the repository pattern
+public interface ICityService
+{
+    /**
+     * Get all the city
+     * @return {@link List}
+     */
+    List<City> getCity();
+
+    /**
+     * Deletes a city
+     * @param cityToDelete
+     */
+    void deleteCity(City cityToDelete);
+
+    /**
+     * Add a city
+     * @param cityToAdd
+     */
+    void addCity(City cityToAdd);
+
+    /**
+     * Get all cities sorted by name
+     * @return {@link List}
+     */
+    List<City> sortCityByName();
+}
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