diff --git a/kozyrev_sergey_lab_4/README.md b/kozyrev_sergey_lab_4/README.md
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+# Лабораторная работа №4 — Работа с брокером сообщений
+## 1. Цель работы
+Изучение проектирования приложений при помощи брокера сообщений RabbitMQ.
+## 2. Как запустить лабораторную работу
+### Предварительные требования:
+* Установленный RabbitMQ Server
+* Python 3.9+
+* Библиотека pika
+### Запуск Tutorial 1
+```bash
+cd tut1
+python receive.py
+python send.py
+```
+![alt text](./screenshots/Tutorial1.png)
+
+### Запуск Tutorial 2
+```bash
+cd tut2
+python worker.py
+python new_task.py
+```
+![alt text](./screenshots/Tutorial2.png)
+
+### Запуск Tutorial 3
+```bash
+cd tut3
+python receive_logs.py
+python emit_log.py
+```
+![alt text](./screenshots/Tutorial3.png)
+
+### Запуск основного приложения
+```bash
+cd app
+python consumer1_slow.py
+python consumer2_fast.py
+python publisher.py
+python consumer1_slow.py
+python consumer1_slow.py
+```
+
+## 3. Структура проекта
+```
+tut1/         # Изучение туториала 1
+tut2/         # Изучение туториала 2
+tut3/         # Изучение туториала 3
+app/          # Создание приложений, обрабатывающих очередь сообщений с разной скоростью
+README.md     # Документация проекта
+```
+### Описание сервисов
+**tut1** — Базовая модель "производитель-потребитель". Демонстрирует отправку и получение простых сообщений через очередь.
+
+**tut2** — Модель распределения задач между несколькими worker'ами. Демонстрирует round-robin балансировку нагрузки и механизм подтверждения обработки сообщений (acknowledgment).
+
+**tut3** — Паттерн fanout exchange. Демонстрирует широковещательную рассылку сообщений всем подписчикам одновременно.
+
+**app** - Система обработки заказов интернет-магазина. Publisher генерирует события заказов каждую секунду. Consumer 1 обрабатывает заказы медленно (2-3 секунды), Consumer 2 — мгновенно. 
+
+## 5. Результаты тестирования
+### Сценарий 1: Один экземпляр каждого consumer
+#### Параметры:
+* Publisher: 1 сообщение/секунду
+* Consumer 1 (slow): 2.5 секунды/сообщение
+* Consumer 2 (fast): мгновенная обработка
+#### Результат:
+* Очередь order_processing_slow: накапливаются сообщения
+* Очередь order_processing_fast: 0 сообщений (успевает обрабатывать)
+#### Вывод: 
+Consumer 1 не справляется с нагрузкой, так как скорость обработки (0.4 сообщения/сек) меньше скорости поступления (1 сообщение/сек).
+### Сценарий 2: Три экземпляра Consumer 1
+#### Параметры:
+* Publisher: 1 сообщение/секунду
+* 3× Consumer 1 (slow): 2.5 секунды/сообщение каждый
+* Consumer 2 (fast): мгновенная обработка
+#### Результат:
+* Очередь order_processing_slow: Спустя некоторое время пустеет и не копит более 1-2х сообщений
+* Сообщения равномерно распределяются между тремя consumers
+RabbitMQ автоматически балансирует нагрузку (round-robin)
+#### Вывод: 
+Три consumer справляются с нагрузкой. Суммарная скорость обработки (1.2 сообщения/сек) превышает скорость поступления (1 сообщение/сек). Демонстрируется горизонтальное масштабирование.
+
+## 6. Используемые технологии
+1. **Python 3.9** — язык программирования
+2. **RabbitMQ** — брокер сообщений
+3. **Pika** — Python клиент для RabbitMQ
+4. **RabbitMQ Management UI** — веб-интерфейс для мониторинга
+
+## 7. Видео
+Ссылка на видео работы RabbitMQ: [Rutube](https://rutube.ru/video/private/d4dc5613005afbbe601862d54b248d36/?p=De8RTMImQZQtab3avfH2Zg)
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diff --git a/kozyrev_sergey_lab_4/app/consumer1_slow.py b/kozyrev_sergey_lab_4/app/consumer1_slow.py
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+import pika
+import json
+import time
+import random
+
+def main():
+    connection = pika.BlockingConnection(
+        pika.ConnectionParameters('localhost')
+    )
+    channel = connection.channel()
+
+    channel.exchange_declare(exchange='orders', exchange_type='fanout')
+
+    queue_name = 'order_processing_slow'
+    channel.queue_declare(queue=queue_name, durable=True)
+
+    channel.queue_bind(exchange='orders', queue=queue_name)
+
+    print(f' [*] Consumer 1 (SLOW) started')
+    print(f' [*] Queue: {queue_name}')
+    print(f' [*] Processing time: 2-3 seconds per order')
+    print(' [*] Waiting for orders. To exit press CTRL+C')
+
+    def callback(ch, method, properties, body):
+        try:
+            order = json.loads(body.decode())
+            print(f" [x] Received order #{order['order_id']}: "
+                  f"{order['product']} - ${order['amount']}")
+            print(f"     Processing order #{order['order_id']}...")
+            
+            processing_time = random.uniform(2.0, 3.0)
+            time.sleep(processing_time)
+            
+            print(f" [✓] Order #{order['order_id']} processed successfully "
+                  f"(took {processing_time:.1f}s)")
+
+            ch.basic_ack(delivery_tag=method.delivery_tag)
+            
+        except Exception as e:
+            print(f" [!] Error processing message: {e}")
+            ch.basic_nack(delivery_tag=method.delivery_tag, requeue=True)
+
+    channel.basic_qos(prefetch_count=1)
+
+    channel.basic_consume(
+        queue=queue_name,
+        on_message_callback=callback
+    )
+
+    try:
+        channel.start_consuming()
+    except KeyboardInterrupt:
+        print('\n [*] Consumer 1 stopped')
+    finally:
+        connection.close()
+
+if __name__ == '__main__':
+    main()
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diff --git a/kozyrev_sergey_lab_4/app/consumer2_fast.py b/kozyrev_sergey_lab_4/app/consumer2_fast.py
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+++ b/kozyrev_sergey_lab_4/app/consumer2_fast.py
@@ -0,0 +1,51 @@
+import pika
+import json
+
+def main():
+    connection = pika.BlockingConnection(
+        pika.ConnectionParameters('localhost')
+    )
+    channel = connection.channel()
+
+    channel.exchange_declare(exchange='orders', exchange_type='fanout')
+
+    queue_name = 'order_processing_fast'
+    channel.queue_declare(queue=queue_name, durable=True)
+
+    channel.queue_bind(exchange='orders', queue=queue_name)
+
+    print(f' [*] Consumer 2 (FAST) started')
+    print(f' [*] Queue: {queue_name}')
+    print(f' [*] Processing time: instant')
+    print(' [*] Waiting for orders. To exit press CTRL+C')
+
+    def callback(ch, method, properties, body):
+        try:
+            order = json.loads(body.decode())
+            print(f" [x] Received order #{order['order_id']}: "
+                  f"{order['product']} - ${order['amount']}")
+            
+            print(f" [✓] Order #{order['order_id']} processed instantly")
+            
+            ch.basic_ack(delivery_tag=method.delivery_tag)
+            
+        except Exception as e:
+            print(f" [!] Error processing message: {e}")
+            ch.basic_nack(delivery_tag=method.delivery_tag, requeue=True)
+
+    channel.basic_qos(prefetch_count=1)
+
+    channel.basic_consume(
+        queue=queue_name,
+        on_message_callback=callback
+    )
+
+    try:
+        channel.start_consuming()
+    except KeyboardInterrupt:
+        print('\n [*] Consumer 2 stopped')
+    finally:
+        connection.close()
+
+if __name__ == '__main__':
+    main()
diff --git a/kozyrev_sergey_lab_4/app/publisher.py b/kozyrev_sergey_lab_4/app/publisher.py
new file mode 100644
index 0000000..5ca327c
--- /dev/null
+++ b/kozyrev_sergey_lab_4/app/publisher.py
@@ -0,0 +1,53 @@
+import pika
+import json
+import time
+from datetime import datetime
+import random
+
+def main():
+    connection = pika.BlockingConnection(
+        pika.ConnectionParameters('localhost')
+    )
+    channel = connection.channel()
+
+    channel.exchange_declare(exchange='orders', exchange_type='fanout')
+
+    print(' [*] Publisher started. Publishing orders every second...')
+    print(' [*] Press CTRL+C to stop')
+    
+    order_id = 1
+
+    try:
+        while True:
+            order = {
+                'order_id': order_id,
+                'customer': f'Customer_{random.randint(1, 100)}',
+                'product': random.choice([
+                    'Laptop', 'Phone', 'Tablet', 
+                    'Headphones', 'Monitor', 'Keyboard'
+                ]),
+                'amount': round(random.uniform(10.0, 1000.0), 2),
+                'timestamp': datetime.now().strftime('%Y-%m-%d %H:%M:%S')
+            }
+            
+            message = json.dumps(order, ensure_ascii=False)
+            
+            channel.basic_publish(
+                exchange='orders',
+                routing_key='', 
+                body=message
+            )
+            
+            print(f" [x] Sent order #{order_id}: {order['product']} "
+                  f"for ${order['amount']} from {order['customer']}")
+            
+            order_id += 1
+            time.sleep(1) 
+            
+    except KeyboardInterrupt:
+        print('\n [*] Publisher stopped')
+    finally:
+        connection.close()
+
+if __name__ == '__main__':
+    main()
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diff --git a/kozyrev_sergey_lab_4/screenshots/Tutorial1.png b/kozyrev_sergey_lab_4/screenshots/Tutorial1.png
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diff --git a/kozyrev_sergey_lab_4/screenshots/Tutorial2.png b/kozyrev_sergey_lab_4/screenshots/Tutorial2.png
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diff --git a/kozyrev_sergey_lab_4/screenshots/Tutorial3.png b/kozyrev_sergey_lab_4/screenshots/Tutorial3.png
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diff --git a/kozyrev_sergey_lab_4/tut1/receive.py b/kozyrev_sergey_lab_4/tut1/receive.py
new file mode 100644
index 0000000..731c7b4
--- /dev/null
+++ b/kozyrev_sergey_lab_4/tut1/receive.py
@@ -0,0 +1,21 @@
+import pika
+
+connection = pika.BlockingConnection(
+    pika.ConnectionParameters('localhost')
+)
+channel = connection.channel()
+
+channel.queue_declare(queue='hello')
+
+def callback(ch, method, properties, body):
+    print(f" [x] Received {body.decode()}")
+
+channel.basic_consume(
+    queue='hello',
+    on_message_callback=callback,
+    auto_ack=True
+)
+
+print(' [*] Waiting for messages. To exit press CTRL+C')
+
+channel.start_consuming()
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diff --git a/kozyrev_sergey_lab_4/tut1/send.py b/kozyrev_sergey_lab_4/tut1/send.py
new file mode 100644
index 0000000..87256b1
--- /dev/null
+++ b/kozyrev_sergey_lab_4/tut1/send.py
@@ -0,0 +1,18 @@
+import pika
+
+connection = pika.BlockingConnection(
+    pika.ConnectionParameters('localhost')
+)
+channel = connection.channel()
+
+channel.queue_declare(queue='hello')
+
+channel.basic_publish(
+    exchange='',
+    routing_key='hello',
+    body='Hello World!'
+)
+
+print(" [x] Sent 'Hello World!'")
+
+connection.close()
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diff --git a/kozyrev_sergey_lab_4/tut2/new_task.py b/kozyrev_sergey_lab_4/tut2/new_task.py
new file mode 100644
index 0000000..a5d3058
--- /dev/null
+++ b/kozyrev_sergey_lab_4/tut2/new_task.py
@@ -0,0 +1,23 @@
+import pika
+import sys
+
+connection = pika.BlockingConnection(
+    pika.ConnectionParameters('localhost')
+)
+channel = connection.channel()
+
+channel.queue_declare(queue='task_queue', durable=True)
+
+message = ' '.join(sys.argv[1:]) or "Hello World...!"
+
+channel.basic_publish(
+    exchange='',
+    routing_key='task_queue',
+    body=message,
+    properties=pika.BasicProperties(
+        delivery_mode=pika.DeliveryMode.Persistent
+    )
+)
+
+print(f" [x] Sent '{message}'")
+connection.close()
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diff --git a/kozyrev_sergey_lab_4/tut2/worker.py b/kozyrev_sergey_lab_4/tut2/worker.py
new file mode 100644
index 0000000..85c17f9
--- /dev/null
+++ b/kozyrev_sergey_lab_4/tut2/worker.py
@@ -0,0 +1,29 @@
+import pika
+import time
+
+connection = pika.BlockingConnection(
+    pika.ConnectionParameters('localhost')
+)
+channel = connection.channel()
+
+channel.queue_declare(queue='task_queue', durable=True)
+
+print(' [*] Waiting for messages. To exit press CTRL+C')
+
+def callback(ch, method, properties, body):
+    print(f" [x] Received {body.decode()}")
+    
+    time.sleep(body.count(b'.'))
+    
+    print(" [x] Done")
+    
+    ch.basic_ack(delivery_tag=method.delivery_tag)
+
+channel.basic_qos(prefetch_count=1)
+
+channel.basic_consume(
+    queue='task_queue',
+    on_message_callback=callback
+)
+
+channel.start_consuming()
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diff --git a/kozyrev_sergey_lab_4/tut3/emit_log.py b/kozyrev_sergey_lab_4/tut3/emit_log.py
new file mode 100644
index 0000000..1aeb19b
--- /dev/null
+++ b/kozyrev_sergey_lab_4/tut3/emit_log.py
@@ -0,0 +1,20 @@
+import pika
+import sys
+
+connection = pika.BlockingConnection(
+    pika.ConnectionParameters('localhost')
+)
+channel = connection.channel()
+
+channel.exchange_declare(exchange='logs', exchange_type='fanout')
+
+message = ' '.join(sys.argv[1:]) or "info: Hello World!"
+
+channel.basic_publish(
+    exchange='logs',
+    routing_key='',
+    body=message
+)
+
+print(f" [x] Sent '{message}'")
+connection.close()
\ No newline at end of file
diff --git a/kozyrev_sergey_lab_4/tut3/receive_logs.py b/kozyrev_sergey_lab_4/tut3/receive_logs.py
new file mode 100644
index 0000000..3213809
--- /dev/null
+++ b/kozyrev_sergey_lab_4/tut3/receive_logs.py
@@ -0,0 +1,26 @@
+import pika
+
+connection = pika.BlockingConnection(
+    pika.ConnectionParameters('localhost')
+)
+channel = connection.channel()
+
+channel.exchange_declare(exchange='logs', exchange_type='fanout')
+
+result = channel.queue_declare(queue='', exclusive=True)
+queue_name = result.method.queue
+
+channel.queue_bind(exchange='logs', queue=queue_name)
+
+print(' [*] Waiting for logs. To exit press CTRL+C')
+
+def callback(ch, method, properties, body):
+    print(f" [x] {body.decode()}")
+
+channel.basic_consume(
+    queue=queue_name,
+    on_message_callback=callback,
+    auto_ack=True
+)
+
+channel.start_consuming()
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