diff --git a/packages/wyatt_architecture/lib/src/package.dart b/packages/wyatt_architecture/lib/src/core/core.dart
similarity index 94%
rename from packages/wyatt_architecture/lib/src/package.dart
rename to packages/wyatt_architecture/lib/src/core/core.dart
index 95c31e2f..122e2dfa 100644
--- a/packages/wyatt_architecture/lib/src/package.dart
+++ b/packages/wyatt_architecture/lib/src/core/core.dart
@@ -14,4 +14,4 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
-String wyatt() => "wyatt_architecture";
\ No newline at end of file
+export 'exceptions/exceptions.dart';
diff --git a/packages/wyatt_architecture/lib/src/core/exceptions/exceptions.dart b/packages/wyatt_architecture/lib/src/core/exceptions/exceptions.dart
new file mode 100644
index 00000000..96a3bf8c
--- /dev/null
+++ b/packages/wyatt_architecture/lib/src/core/exceptions/exceptions.dart
@@ -0,0 +1,40 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'package:wyatt_type_utils/wyatt_type_utils.dart';
+
+abstract class AppException implements Exception {
+  final String? message;
+
+  AppException([this.message]);
+
+  @override
+  String toString() {
+    if (message.isNotNullOrEmpty) {
+      return '$runtimeType: $message';
+    } else {
+      return '$runtimeType: An exception occured';
+    }
+  }
+}
+
+class ClientException extends AppException {
+  ClientException([super.message]);
+}
+
+class ServerException extends AppException {
+  ServerException([super.message]);
+}
diff --git a/packages/wyatt_architecture/lib/src/domain/data_sources/data_sources.dart b/packages/wyatt_architecture/lib/src/domain/data_sources/data_sources.dart
new file mode 100644
index 00000000..c226b67b
--- /dev/null
+++ b/packages/wyatt_architecture/lib/src/domain/data_sources/data_sources.dart
@@ -0,0 +1,19 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+export 'base_data_source.dart';
+export 'local/local.dart';
+export 'remote/remote.dart';
diff --git a/packages/wyatt_architecture/lib/src/domain/data_sources/local/local.dart b/packages/wyatt_architecture/lib/src/domain/data_sources/local/local.dart
new file mode 100644
index 00000000..08fce718
--- /dev/null
+++ b/packages/wyatt_architecture/lib/src/domain/data_sources/local/local.dart
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+export 'base_local_data_source.dart';
diff --git a/packages/wyatt_architecture/lib/src/domain/data_sources/remote/remote.dart b/packages/wyatt_architecture/lib/src/domain/data_sources/remote/remote.dart
new file mode 100644
index 00000000..81d8f125
--- /dev/null
+++ b/packages/wyatt_architecture/lib/src/domain/data_sources/remote/remote.dart
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+export 'base_remote_data_source.dart';
diff --git a/packages/wyatt_architecture/lib/src/domain/domain.dart b/packages/wyatt_architecture/lib/src/domain/domain.dart
new file mode 100644
index 00000000..35c41307
--- /dev/null
+++ b/packages/wyatt_architecture/lib/src/domain/domain.dart
@@ -0,0 +1,20 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+export 'data_sources/data_sources.dart';
+export 'entities/entities.dart';
+export 'repositories/repositories.dart';
+export 'usecases/usecases.dart';
diff --git a/packages/wyatt_architecture/lib/src/domain/entities/entities.dart b/packages/wyatt_architecture/lib/src/domain/entities/entities.dart
new file mode 100644
index 00000000..47ef61fa
--- /dev/null
+++ b/packages/wyatt_architecture/lib/src/domain/entities/entities.dart
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+export 'entity.dart';
diff --git a/packages/wyatt_architecture/lib/src/domain/entities/entity.dart b/packages/wyatt_architecture/lib/src/domain/entities/entity.dart
index cd66df2b..67df1106 100644
--- a/packages/wyatt_architecture/lib/src/domain/entities/entity.dart
+++ b/packages/wyatt_architecture/lib/src/domain/entities/entity.dart
@@ -14,4 +14,6 @@
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
-abstract class Entity {}
+abstract class Entity {
+  const Entity();
+}
diff --git a/packages/wyatt_architecture/lib/src/domain/repositories/base_repository.dart b/packages/wyatt_architecture/lib/src/domain/repositories/base_repository.dart
new file mode 100644
index 00000000..f6127411
--- /dev/null
+++ b/packages/wyatt_architecture/lib/src/domain/repositories/base_repository.dart
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+class BaseRepository {}
diff --git a/packages/wyatt_architecture/lib/src/domain/repositories/repositories.dart b/packages/wyatt_architecture/lib/src/domain/repositories/repositories.dart
new file mode 100644
index 00000000..bc97c14e
--- /dev/null
+++ b/packages/wyatt_architecture/lib/src/domain/repositories/repositories.dart
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+export 'base_repository.dart';
diff --git a/packages/wyatt_architecture/lib/src/domain/usecases/no_param.dart b/packages/wyatt_architecture/lib/src/domain/usecases/no_param.dart
new file mode 100644
index 00000000..7452af67
--- /dev/null
+++ b/packages/wyatt_architecture/lib/src/domain/usecases/no_param.dart
@@ -0,0 +1,21 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'package:wyatt_architecture/src/domain/entities/entity.dart';
+
+class NoParam extends Entity {
+  const NoParam();
+}
diff --git a/packages/wyatt_architecture/lib/src/domain/usecases/usecase.dart b/packages/wyatt_architecture/lib/src/domain/usecases/usecase.dart
new file mode 100644
index 00000000..417695ca
--- /dev/null
+++ b/packages/wyatt_architecture/lib/src/domain/usecases/usecase.dart
@@ -0,0 +1,25 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+// 
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+// 
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+// 
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+import 'package:wyatt_architecture/src/core/exceptions/exceptions.dart';
+import 'package:wyatt_type_utils/wyatt_type_utils.dart';
+
+typedef FutureResult<T> = Future<Result<T, AppException>>;
+
+// ignore: one_member_abstracts
+abstract class UseCase<Parameters, ReturnType> {
+  FutureResult<ReturnType> call(Parameters params);
+}
diff --git a/packages/wyatt_architecture/lib/src/domain/usecases/usecases.dart b/packages/wyatt_architecture/lib/src/domain/usecases/usecases.dart
new file mode 100644
index 00000000..31b702da
--- /dev/null
+++ b/packages/wyatt_architecture/lib/src/domain/usecases/usecases.dart
@@ -0,0 +1,17 @@
+// Copyright (C) 2022 WYATT GROUP
+// Please see the AUTHORS file for details.
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+export 'usecase.dart';
diff --git a/packages/wyatt_architecture/lib/src/src.dart b/packages/wyatt_architecture/lib/src/src.dart
index 72924ab1..50ef204e 100644
--- a/packages/wyatt_architecture/lib/src/src.dart
+++ b/packages/wyatt_architecture/lib/src/src.dart
@@ -1,17 +1,18 @@
 // Copyright (C) 2022 WYATT GROUP
 // Please see the AUTHORS file for details.
-//
+// 
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU General Public License as published by
 // the Free Software Foundation, either version 3 of the License, or
 // any later version.
-//
+// 
 // This program is distributed in the hope that it will be useful,
 // but WITHOUT ANY WARRANTY; without even the implied warranty of
 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 // GNU General Public License for more details.
-//
+// 
 // You should have received a copy of the GNU General Public License
 // along with this program. If not, see <https://www.gnu.org/licenses/>.
 
-export 'package.dart';
\ No newline at end of file
+export 'core/core.dart';
+export 'domain/domain.dart';