diff --git a/data/src/main/java/one/nem/kidshift/data/TaskData.java b/data/src/main/java/one/nem/kidshift/data/TaskData.java
index 3a990f1..b67ed02 100644
--- a/data/src/main/java/one/nem/kidshift/data/TaskData.java
+++ b/data/src/main/java/one/nem/kidshift/data/TaskData.java
@@ -22,9 +22,9 @@ public interface TaskData {
 
     /**
      * タスクを削除する
-     * @param task タスク
+     * @param taskId タスクID
      */
-    void removeTask(TaskItemModel task);
+    void removeTask(String taskId);
 
     /**
      * タスクを更新する
diff --git a/data/src/main/java/one/nem/kidshift/data/impl/TaskDataDummyImpl.java b/data/src/main/java/one/nem/kidshift/data/impl/TaskDataDummyImpl.java
index 6f8f874..4c5af1b 100644
--- a/data/src/main/java/one/nem/kidshift/data/impl/TaskDataDummyImpl.java
+++ b/data/src/main/java/one/nem/kidshift/data/impl/TaskDataDummyImpl.java
@@ -43,4 +43,36 @@ public class TaskDataDummyImpl implements TaskData {
 //        logger.info("Returning tasks: " + tasks);
         return tasks;
     }
+
+    @Override
+    public void addTask(TaskItemModel task) {
+        logger.info("addTask called");
+        logger.info("Task: " + task);
+    }
+
+    @Override
+    public void removeTask(String taskId) {
+        logger.info("removeTask called");
+        logger.info("Task ID: " + taskId);
+    }
+
+    @Override
+    public void updateTask(TaskItemModel task) {
+        logger.info("updateTask called");
+        logger.info("Task: " + task);
+    }
+
+    @Override
+    public TaskItemModel getTask(String taskId) {
+        List<TaskItemModel> tasks = getTasks();
+        // return random task
+        return tasks.get(faker.number().numberBetween(0, tasks.size()));
+    }
+
+    @Override
+    public void recordTaskCompletion(String taskId, String childId) {
+        logger.info("recordTaskCompletion called");
+        logger.info("Task ID: " + taskId);
+        logger.info("Child ID: " + childId);
+    }
 }