diff --git a/Lesson_5/Task_1/WorkWithFiles/CopyDirectory.cs b/Lesson_5/Task_1/Classes/CopyDirectory.cs
similarity index 92%
rename from Lesson_5/Task_1/WorkWithFiles/CopyDirectory.cs
rename to Lesson_5/Task_1/Classes/CopyDirectory.cs
index 4ecdbe7..2d4a63b 100644
--- a/Lesson_5/Task_1/WorkWithFiles/CopyDirectory.cs
+++ b/Lesson_5/Task_1/Classes/CopyDirectory.cs
@@ -1,6 +1,8 @@
-namespace Lesson5_WorkWithFiles.CopyDirectory;
+namespace Lesson5.Classes;
 
-public class CopyDirectory
+using Lesson5.Interfaces;
+
+public class CopyDirectory : ICopyDirectory
 {
     public static void Copy(string sourceDir, string destinationDir, bool recursive)
     {
diff --git a/Lesson_5/Task_1/Classes/FileInfoOperation.cs b/Lesson_5/Task_1/Classes/FileInfoOperation.cs
new file mode 100644
index 0000000..152adf6
--- /dev/null
+++ b/Lesson_5/Task_1/Classes/FileInfoOperation.cs
@@ -0,0 +1,16 @@
+namespace Lesson5.Classes;
+
+using Lesson5.Interfaces;
+
+public class FileInfoOperation : IFileInfoOperation
+{
+
+    public static void GetFileInfo(string path)
+    {
+        var info = new FileInfo(path);
+        
+        Console.WriteLine($"Name: {info.Name}");
+        Console.WriteLine($"Creation time: {info.CreationTime}");
+        Console.WriteLine($"Length: {info.Length}");
+    }
+}
diff --git a/Lesson_5/Task_1/WorkWithFiles/ReadWrite.cs b/Lesson_5/Task_1/Classes/ReadFile.cs
similarity index 51%
rename from Lesson_5/Task_1/WorkWithFiles/ReadWrite.cs
rename to Lesson_5/Task_1/Classes/ReadFile.cs
index 257d0a4..cc606d1 100644
--- a/Lesson_5/Task_1/WorkWithFiles/ReadWrite.cs
+++ b/Lesson_5/Task_1/Classes/ReadFile.cs
@@ -1,6 +1,8 @@
-namespace Lesson5_WorkWithFiles.WorkWithFiles;
+namespace Lesson5.Classes;
 
-public static class ReadWrite
+using Lesson5.Interfaces;
+
+public class ReadFile : IReadFile
 {
     public static void ReadByPath(string path)
     {
@@ -11,9 +13,4 @@ public static class ReadWrite
             Console.WriteLine(str);   
         }
     }
-
-    public static void WriteToFile(string text, string path)
-    {
-        File.WriteAllText(text, path);
-    }
 }
diff --git a/Lesson_5/Task_1/Classes/UserInput.cs b/Lesson_5/Task_1/Classes/UserInput.cs
new file mode 100644
index 0000000..30aa9a0
--- /dev/null
+++ b/Lesson_5/Task_1/Classes/UserInput.cs
@@ -0,0 +1,17 @@
+namespace Lesson5.Classes;
+
+using Lesson5.Interfaces;
+
+public class UserInput : IUserInput
+{
+    public static string AskStringInput(string prompt)
+    {
+        while (true)
+        {
+            Console.Write(prompt);
+            string? input = Console.ReadLine();
+            if (!string.IsNullOrEmpty(input))
+                return input;
+        }
+    }
+}
diff --git a/Lesson_5/Task_1/Classes/WorkWithFileSystem.cs b/Lesson_5/Task_1/Classes/WorkWithFileSystem.cs
new file mode 100644
index 0000000..5ec8aad
--- /dev/null
+++ b/Lesson_5/Task_1/Classes/WorkWithFileSystem.cs
@@ -0,0 +1,43 @@
+namespace Lesson5.Classes;
+
+using Lesson5.Interfaces;
+
+public class WorkWithFileSystem : IWorkWithFileSystem
+{
+    public static void GetDirectoryFiles(string path)
+    {
+        var current = new DirectoryInfo(path);
+        var dirs = Directory.GetDirectories(current.FullName);
+        var files = Directory.GetFiles(current.FullName);
+        
+        foreach (var dir in dirs)
+        {
+            Console.WriteLine(dir.Split('\\').Last() + "/");
+        }
+        foreach (var file in files)
+        {
+            Console.WriteLine(file.Split('\\').Last());
+        }
+    }
+
+    public static string Cd(string name, string current)
+    {
+        if (name == "..")
+        {
+            var info = new DirectoryInfo(current);
+
+            var parent = info.Parent;
+
+            return parent is not null ? parent.FullName : current;
+        }
+        
+        var dir = Path.Combine(current, name);
+        
+        if (Directory.Exists(dir))
+        {
+            return dir;
+        }
+
+        return current;
+    }
+}
diff --git a/Lesson_5/Task_1/FileSystem/WorkWithFileSystem.cs b/Lesson_5/Task_1/FileSystem/WorkWithFileSystem.cs
deleted file mode 100644
index 0d0ba80..0000000
--- a/Lesson_5/Task_1/FileSystem/WorkWithFileSystem.cs
+++ /dev/null
@@ -1,101 +0,0 @@
-namespace Lesson5_WorkWithFiles.FileSystem;
-
-public static class WorkWithFileSystem
-{
-    public static void GetDrives()
-    {
-        var drives = DriveInfo.GetDrives();
-
-        foreach (var drive in drives)
-        {
-            Console.WriteLine($"Name: {drive.Name}");
-            Console.WriteLine($"Size: {drive.TotalSize * Math.Pow(10, -9) }");
-            Console.WriteLine($"Free: {drive.AvailableFreeSpace * Math.Pow(10, -9) }");
-
-            Console.WriteLine("-------------------");
-        }
-    }
-
-    public static void GetCurrentDirectoryFiles()
-    {
-        var dir = Directory.GetCurrentDirectory();
-        var files = new List<string>();
-        files.AddRange(Directory.GetDirectories(dir));
-        files.AddRange(Directory.GetFiles(dir));
-
-        foreach (var file in files)
-        {
-            Console.WriteLine(file.Split('\\').Last());
-        }
-    }
-
-    // cd variant with SetCurrentDirectoryMethod
-    public static void SetCurrentDirectory(string name, string current)
-    {
-        if (name == "..")
-        {
-            var info = new DirectoryInfo(current);
-
-            var parent = info.Parent;
-            
-            if(parent is null) return;
-            
-            Directory.SetCurrentDirectory(parent.FullName);
-        }
-        
-        var dir = Path.Combine(current, name);
-        
-        if (Directory.Exists(dir))
-        {
-            Directory.SetCurrentDirectory(dir);
-        }
-    }
-
-    public static void GetDirectoryFiles(string path)
-    {
-        var current = new DirectoryInfo(path);
-        var dirs = Directory.GetDirectories(current.FullName);
-        var files = Directory.GetFiles(current.FullName);
-        
-        foreach (var dir in dirs)
-        {
-            Console.WriteLine(dir.Split('\\').Last() + "/");
-        }
-        foreach (var file in files)
-        {
-            Console.WriteLine(file.Split('\\').Last());
-        }
-    }
-
-    public static string Cd(string name, string current)
-    {
-        if (name == "..")
-        {
-            var info = new DirectoryInfo(current);
-
-            var parent = info.Parent;
-
-            return parent is not null ? parent.FullName : current;
-        }
-        
-        var dir = Path.Combine(current, name);
-        
-        if (Directory.Exists(dir))
-        {
-            return dir;
-        }
-
-        return current;
-    }
-
-    public static string AskStringInput(string prompt)
-    {
-        while (true)
-        {
-            Console.Write(prompt);
-            string? input = Console.ReadLine();
-            if (!string.IsNullOrEmpty(input))
-                return input;
-        }
-    }
-}
diff --git a/Lesson_5/Task_1/Interfaces/ICopyDirectory.cs b/Lesson_5/Task_1/Interfaces/ICopyDirectory.cs
new file mode 100644
index 0000000..81d7c3b
--- /dev/null
+++ b/Lesson_5/Task_1/Interfaces/ICopyDirectory.cs
@@ -0,0 +1,6 @@
+namespace Lesson5.Interfaces;
+
+public interface ICopyDirectory
+{
+    public static abstract void Copy(string sourceDir, string destinationDir, bool recursive);
+}
diff --git a/Lesson_5/Task_1/Interfaces/IFileInfoOperation.cs b/Lesson_5/Task_1/Interfaces/IFileInfoOperation.cs
new file mode 100644
index 0000000..cf799e8
--- /dev/null
+++ b/Lesson_5/Task_1/Interfaces/IFileInfoOperation.cs
@@ -0,0 +1,6 @@
+namespace Lesson5.Interfaces;
+
+public interface IFileInfoOperation
+{
+    public static abstract void GetFileInfo(string path);
+}
diff --git a/Lesson_5/Task_1/Interfaces/IReadFile.cs b/Lesson_5/Task_1/Interfaces/IReadFile.cs
new file mode 100644
index 0000000..fdd429f
--- /dev/null
+++ b/Lesson_5/Task_1/Interfaces/IReadFile.cs
@@ -0,0 +1,6 @@
+namespace Lesson5.Interfaces;
+
+public interface IReadFile
+{
+    public static abstract void ReadByPath(string path);
+}
diff --git a/Lesson_5/Task_1/Interfaces/IUserInput.cs b/Lesson_5/Task_1/Interfaces/IUserInput.cs
new file mode 100644
index 0000000..10e579a
--- /dev/null
+++ b/Lesson_5/Task_1/Interfaces/IUserInput.cs
@@ -0,0 +1,6 @@
+namespace Lesson5.Interfaces;
+
+public interface IUserInput
+{
+    public static abstract string AskStringInput(string prompt);
+}
diff --git a/Lesson_5/Task_1/Interfaces/IWorkWithFileSystem.cs b/Lesson_5/Task_1/Interfaces/IWorkWithFileSystem.cs
new file mode 100644
index 0000000..c09cbaa
--- /dev/null
+++ b/Lesson_5/Task_1/Interfaces/IWorkWithFileSystem.cs
@@ -0,0 +1,7 @@
+namespace Lesson5.Interfaces;
+
+public interface IWorkWithFileSystem
+{
+    public static abstract void GetDirectoryFiles(string path);
+    public static abstract string Cd(string name, string current);
+}
diff --git a/Lesson_5/Task_1/Program.cs b/Lesson_5/Task_1/Program.cs
index ad637ee..69a4514 100644
--- a/Lesson_5/Task_1/Program.cs
+++ b/Lesson_5/Task_1/Program.cs
@@ -4,10 +4,8 @@
 * License: Unlicense
 */
 
-
-using Lesson5_WorkWithFiles.FileSystem;
-using Lesson5_WorkWithFiles.WorkWithFiles;
-using Lesson5_WorkWithFiles.CopyDirectory;
+using Lesson5.Classes;
+using Lesson5.Interfaces;
 
 var dir = Directory.GetCurrentDirectory();
 string? command;
@@ -30,17 +28,17 @@ info - get data info
     switch (command)
     {
         case "cd":
-            dir = WorkWithFileSystem.Cd(WorkWithFileSystem.AskStringInput("Enter the directory name: "), dir);
+            dir = WorkWithFileSystem.Cd(UserInput.AskStringInput("Enter the directory name: "), dir);
             break;
         case "dir":
             WorkWithFileSystem.GetDirectoryFiles(dir);
             break;
         case "open":
-            ReadWrite.ReadByPath(WorkWithFileSystem.AskStringInput("Enter the file name: "));
+            ReadFile.ReadByPath(UserInput.AskStringInput("Enter the file name: "));
             break;
         case "mv":
-            string moveSource = Path.Combine(dir, WorkWithFileSystem.AskStringInput("Enter the source: "));
-            string moveDestination = Path.Combine(dir, WorkWithFileSystem.AskStringInput("Enter the destination: "));
+            string moveSource = Path.Combine(dir, UserInput.AskStringInput("Enter the source: "));
+            string moveDestination = Path.Combine(dir, UserInput.AskStringInput("Enter the destination: "));
 
             if (Directory.Exists(moveSource) || File.Exists(moveSource))
                 Directory.Move(moveSource, moveDestination);
@@ -48,7 +46,7 @@ info - get data info
                 Console.WriteLine("Not found.");
             break;
         case "rm":
-            string path = Path.Combine(dir, WorkWithFileSystem.AskStringInput("Enter the file or directory to delete: "));
+            string path = Path.Combine(dir, UserInput.AskStringInput("Enter the file or directory to delete: "));
 
             if (Directory.Exists(path))
                 Directory.Delete(path, true);
@@ -58,8 +56,8 @@ info - get data info
                 Console.WriteLine("Not found.");
             break;
         case "cp":
-            string copySource = Path.Combine(dir, WorkWithFileSystem.AskStringInput("Enter the source: "));
-            string copyDestination = Path.Combine(dir, WorkWithFileSystem.AskStringInput("Enter the destination: "));
+            string copySource = Path.Combine(dir, UserInput.AskStringInput("Enter the source: "));
+            string copyDestination = Path.Combine(dir, UserInput.AskStringInput("Enter the destination: "));
 
             if (Directory.Exists(copySource))
                 CopyDirectory.Copy(copySource, copyDestination, true);
@@ -69,7 +67,7 @@ info - get data info
                 Console.WriteLine("Not found.");
             break;
         case "info":
-            FileInfoOperation.GetFileInfo(WorkWithFileSystem.AskStringInput("Enter the file name: "));
+            FileInfoOperation.GetFileInfo(UserInput.AskStringInput("Enter the file name: "));
             break;
         default:
             Console.WriteLine("Unknown command");
diff --git a/Lesson_5/Task_1/WorkWithFiles/FileInfoOperation.cs b/Lesson_5/Task_1/WorkWithFiles/FileInfoOperation.cs
deleted file mode 100644
index f180adc..0000000
--- a/Lesson_5/Task_1/WorkWithFiles/FileInfoOperation.cs
+++ /dev/null
@@ -1,31 +0,0 @@
-namespace Lesson5_WorkWithFiles.WorkWithFiles;
-
-public static class FileInfoOperation
-{
-    public static string CreateFile(string dir, string name)
-    {
-        var path = Path.Combine(dir, name);
-
-        var file = new FileInfo(path);
-        if (!file.Exists) file.Create();
-
-        return file.FullName;
-    }
-
-    public static void GetFileInfo(string path)
-    {
-        var info = new FileInfo(path);
-        
-        Console.WriteLine($"Name: {info.Name}");
-        Console.WriteLine($"Creation time: {info.CreationTime}");
-        Console.WriteLine($"Length: {info.Length}");
-    }
-
-    public static void MoveFile(string filePath, string newPath)
-    {
-        var fileInfo = new FileInfo(filePath);
-        newPath = Path.Combine(newPath, fileInfo.Name);
-        
-        fileInfo.MoveTo(newPath);
-    }
-}
diff --git a/Lesson_5/Task_1/WorkWithFiles/StreamUsing.cs b/Lesson_5/Task_1/WorkWithFiles/StreamUsing.cs
deleted file mode 100644
index fcefe30..0000000
--- a/Lesson_5/Task_1/WorkWithFiles/StreamUsing.cs
+++ /dev/null
@@ -1,30 +0,0 @@
-using System.Text;
-
-namespace Lesson5_WorkWithFiles.WorkWithFiles;
-
-public static class StreamUsing
-{
-    public static void ReadFromFile(string path)
-    {
-        using (FileStream fstream = File.OpenRead(path))
-        {
-            var bytes = new byte[fstream.Length];
-            
-            fstream.Read(bytes, 0, bytes.Length);
-
-            string result = Encoding.Default.GetString(bytes);
-            Console.WriteLine(result);
-        }
-    }
-    
-    public static void WriteToFile(string path, string text)
-    {
-        // you can write using in one line
-        
-        using FileStream fstream = new FileStream(path, FileMode.OpenOrCreate);
-        var bytes = Encoding.Default.GetBytes(text);
-            
-        fstream.Write(bytes, 0, bytes.Length);
-        Console.WriteLine("Written");
-    }
-}