diff --git a/e4e_data_management/duplicator.py b/e4e_data_management/duplicator.py
index adaea5f..3d4b963 100644
--- a/e4e_data_management/duplicator.py
+++ b/e4e_data_management/duplicator.py
@@ -1,13 +1,44 @@
 '''Duplication Tool main logic
 '''
 import argparse
+from pathlib import Path
+from typing import Iterable, List
+
+from e4e_data_management.validator import Dataset
 
 
 class Duplicator:
     """Duplication Tool application logic
     """
-    def __init__(self):
-        pass
+    def __init__(self,
+        source: Path,
+        destinations: Iterable[Path],
+        *,
+        verification_method: str = 'hash'):
+        self.source = source
+        self.destinations = destinations
+        self.__method = verification_method
+
+        self.__validate_args()
+        self.dataset = Dataset(self.source)
+
+    def duplicate(self):
+        """Does the duplication
+        """
+        self.dataset.generate_manifest()
+        # TODO: Duplicate
+
+    def verify(self):
+        """Verifies the output
+        """
+        reference_manifest = self.dataset.get_manifest()
+        for destination in self.destinations:
+            Dataset(destination).validate(reference_manifest, method=self.__method)
+
+    def __validate_args(self):
+        assert self.source.is_dir()
+        assert len(self.destinations) > 0
+        assert all(dest.is_dir() for dest in self.destinations)
 
 def gui():
     """GUI Entry Point
@@ -19,10 +50,27 @@ def cli():
     parser = argparse.ArgumentParser(
         description="Expedition Data Duplication Tool"
     )
+    parser.add_argument('source', type=Path)
+    parser.add_argument('destination', nargs='+', type=Path)
 
     args = parser.parse_args()
 
-    app = Duplicator()
+    source: Path = args.source
+    if not source.is_dir():
+        raise RuntimeError('Source is not a directory')
+
+    destinations: List[Path] = args.destination
+
+    if not all(dest.is_dir() for dest in destinations):
+        raise RuntimeError('Destination is not a directory')
+
+
+    app = Duplicator(
+        source=source,
+        destinations=destinations
+    )
+
+    app.duplicate()
 
 if __name__ == '__main__':
     cli()