diff --git a/Roadmap/26 - SOLID SRP/dart/EmilianoAngel.dart b/Roadmap/26 - SOLID SRP/dart/EmilianoAngel.dart
new file mode 100644
index 0000000000..62aa48846f
--- /dev/null
+++ b/Roadmap/26 - SOLID SRP/dart/EmilianoAngel.dart	
@@ -0,0 +1,150 @@
+// Incorrecto
+// class User {
+//   String name;
+//   String email;
+
+//   User(this.name, this.email);
+
+//   void saveToDatabase(String name, String email) {
+//     print('User $name with email $email saved to database.');
+//   }
+
+//   void sendWelcomeEmail(String email) {
+//     print('Welcome email sent to $email');
+//   }
+
+// }
+
+// Corecto
+
+class User {
+  String name;
+  String email;
+
+  User(this.name, this.email);
+}
+
+class UserSeervice {
+  void saveToDatabase(String name, String email) {
+    print('User $name with email $email saved to database.');
+  }
+}
+
+class EmailService {
+  void sendWelcomeEmail(String email) {
+    print('Welcome email sent to $email');
+  }
+}
+
+// Ejercicio de biblioteca
+
+// Icorrecto
+// class Biblioteca {
+//   List<Map<String, dynamic>> books = [];
+//   List<Map<String, dynamic>> users = [];
+//   List<String> loans = [];
+
+//   void addBook(String title, String author, int copies) {
+//     books.add({'title': title, 'author': author, 'copies': copies});
+//     print('Book "$title" added to the library.');
+//   }
+
+//   void addUser(String name, String userId, int email) {
+//     users.add({'name': name, 'userId': userId, 'email': email});
+//     print('User "$userId" added to the database.');
+//   }
+
+//   void loanBook(String userId, String bookTitle) {
+//     var user = users.firstWhere((u) => u['userId'] == userId, orElse: () => {});
+//     var book = books.firstWhere((b) => b['title'] == bookTitle, orElse: () => {});
+
+//     if (user.isEmpty) {
+//       print('User not found.');
+//       return;
+//     }
+
+//     if (book.isEmpty || book['copies'] <= 0) {
+//       print('Book not available.');
+//       return;
+//     }
+
+//     book['copies'] -= 1;
+//     loans.add('User $userId loaned "$bookTitle"');
+//     print('Book "$bookTitle" loaned to user $userId.');
+//   }
+
+//   void returnBook(String userId, String bookTitle) {
+//     var book = books.firstWhere((b) => b['title'] == bookTitle, orElse: () => {});
+
+//     if (book.isEmpty) {
+//       print('Book not found in the library.');
+//       return;
+//     }
+
+//     book['copies'] += 1;
+//     loans.remove('User $userId loaned "$bookTitle"');
+//     print('Book "$bookTitle" returned by user $userId.');
+//   }
+// }
+
+// Correcto 
+class Book {
+  String title;
+  String author;
+  int copies;
+
+  Book(this.title, this.author, this.copies);
+}
+
+class LibraryUser {
+  String name;
+  String userId;
+  String email;
+
+  LibraryUser(this.name, this.userId, this.email);
+}
+
+class Loan {
+  List<Map<String, dynamic>> loans = [];
+
+  void loanBook(LibraryUser user, Book book) {
+    if (book.copies <= 0) {
+      print('Book not available.');
+      return;
+    }
+
+    book.copies -= 1;
+    loans.add({'userId': user.userId, 'bookTitle': book.title});
+    print('Book "${book.title}" loaned to user ${user.userId}.');
+  }
+
+  void returnBook(LibraryUser user, Book book) {
+    book.copies += 1;
+    loans.removeWhere((loan) => loan['userId'] == user.userId && loan['bookTitle'] == book.title);
+    print('Book "${book.title}" returned by user ${user.userId}.');
+  }
+}
+
+class Library {
+  List<Book> books = [];
+  List<LibraryUser> users = [];
+  Loan loanService = Loan();
+
+  void addBook(Book book) {
+    books.add(book);
+    print('Book "$book.title" added to the library.');
+  }
+
+  void addUser(LibraryUser user) {
+    users.add(user);
+    print('User "${user.userId}" added to the database.');
+  }
+
+  loanBook(LibraryUser user, Book book) {
+    loanService.loanBook(user, book);
+  }
+
+  returnBook(LibraryUser user, Book book) {
+    loanService.returnBook(user, book);
+  }
+}
\ No newline at end of file
diff --git a/Roadmap/27 - SOLID OCP/dart/EmilianoAngel.dart b/Roadmap/27 - SOLID OCP/dart/EmilianoAngel.dart
new file mode 100644
index 0000000000..0f36d75d89
--- /dev/null
+++ b/Roadmap/27 - SOLID OCP/dart/EmilianoAngel.dart	
@@ -0,0 +1,119 @@
+// Incorrecto
+// class Form {
+
+//   void drawSquare() {
+//     print('Dibujar un cuadrado');
+//   }
+
+//   void drawCircle() {
+//     print('Dibujar un círculo');
+//   }
+// }
+
+// Correcto
+abstract class Form {
+  void draw();
+}
+
+class Square implements Form {
+  @override
+  void draw() {
+    print('Dibujar un cuadrado');
+  }
+}
+
+class Circle implements Form {
+  @override
+  void draw() {
+    print('Dibujar un círculo');
+  }
+}
+
+class Triangle implements Form {
+  @override
+  void draw() {
+    print('Dibujar un triángulo');
+  }
+}
+
+// Ejercicio de calculadora
+
+abstract class Operation {
+  double execute(double a, double b) {
+    return 0;
+  }
+}
+
+class Addition implements Operation {
+  @override
+  double execute(double a, double b) {
+    return a + b;
+  }
+}
+
+class Subtraction implements Operation {
+  @override
+  double execute(double a, double b) {
+    return a - b;
+  }
+}
+
+class Multiplication implements Operation {
+  @override
+  double execute(double a, double b) {
+    return a * b;
+  }
+}
+
+class Division implements Operation {
+  @override
+  double execute(double a, double b) {
+    if (b == 0) {
+      throw Exception('Division by zero is not allowed.');
+    }
+    return a / b;
+  }
+}
+
+class Power implements Operation {
+  @override
+  double execute(double a, double b) {
+    double result = 1;
+    for(int i = 0; i < b; i++) {
+      result *= a;
+    }
+    return result;
+  }
+}
+
+class Calculator {
+  final Map<String, dynamic> _operations = {};
+
+  void addOperation(String name, Operation operation) {
+    _operations[name] = operation;
+  }
+  double calculate(String name, double a, double b) {
+    final operation = _operations[name];
+    if (operation == null) {
+      throw ArgumentError('Operation $name not supported.');
+    }
+    return operation.execute(a,b);
+  }
+}
+
+void main () {
+  Calculator calculator = Calculator();
+
+  calculator.addOperation('addition', Addition());
+  calculator.addOperation('substraction', Subtraction());
+  calculator.addOperation('multiplication', Multiplication());
+  calculator.addOperation('division', Division());
+  calculator.addOperation('power', Power());
+
+  print(calculator.calculate('addition', 5, 3));
+  print(calculator.calculate('substraction', 6, 3));
+  print(calculator.calculate('multiplication', 5, 2));
+  print(calculator.calculate('division', 12, 6));
+  print(calculator.calculate('power', 2, 3));
+ 
+}