diff --git a/6_tasks/6_12_1_callback_theory.py b/6_tasks/6_12_1_callback_theory.py
new file mode 100644
index 0000000..8ea3f13
--- /dev/null
+++ b/6_tasks/6_12_1_callback_theory.py
@@ -0,0 +1,22 @@
+import asyncio
+
+
+async def async_operation():
+    print("Асинхронная операция началась...")
+    await asyncio.sleep(2)
+    print("Асинхронная операция завершена.")
+    return "Результат асинхронной операции"
+
+
+def on_completion(task):  # Callback-функция
+    result = task.result()
+    print(f"Callback функция вызвана. Получен результат: {result}")
+
+
+async def main():
+    task = asyncio.create_task(async_operation())
+    task.add_done_callback(on_completion)  # Регистрация callback-функции
+    await task
+
+
+asyncio.run(main())
diff --git a/6_tasks/6_12_callback_theory.py b/6_tasks/6_12_callback_theory.py
new file mode 100644
index 0000000..1c83587
--- /dev/null
+++ b/6_tasks/6_12_callback_theory.py
@@ -0,0 +1,22 @@
+from typing import Callable
+
+
+def greeting(name):
+    return f"Привет, {name}!"
+
+
+def farewell(name):
+    return f"Пока, {name}!"
+
+
+def process_name(callback: Callable, name: str):
+    return callback(name)
+
+
+name = "Студент"
+
+greeting_result = process_name(greeting, name)
+print(greeting_result)
+
+farewell_result = process_name(farewell, name)
+print(farewell_result)