diff --git a/LoopDataConverter/input/input_data.py b/LoopDataConverter/input/input_data.py
new file mode 100644
index 0000000..2fa7cdc
--- /dev/null
+++ b/LoopDataConverter/input/input_data.py
@@ -0,0 +1,22 @@
+from dataclasses import dataclass
+from ..datatypes import Datatype
+
+
+
+@dataclass
+class InputData:
+    geology: Datatype.GEOLOGY = None
+    structure: Datatype.STRUCTURE = None
+    fault: Datatype.FAULT = None
+    fold: Datatype.FOLD = None
+
+
+    def __getitem__(self, datatype: Datatype):
+
+        return self.__dict__[datatype]
+
+@dataclass 
+class OutputData(InputData):
+    
+    def __getitem__(self, datatype: Datatype):
+        return super().__getitem__(datatype)
\ No newline at end of file