diff --git a/src/metadata_review_lib.py b/src/metadata_review_lib.py
index d97bca6..17f47df 100644
--- a/src/metadata_review_lib.py
+++ b/src/metadata_review_lib.py
@@ -322,23 +322,23 @@ class MetadataHarvester:
             parent_files = []
         self.parent_files = parent_files
         self.metadata = {
-            "samples": {},
+            "sample": {},
             "environment": {},
-            "instrument": {},
-            "data_level": {}
+            "instruments": {},
+            "datasets": {}
         }
 
     def add_sample_info(self, key_or_dict, value=None):
-        self._add_info("samples", key_or_dict, value)
+        self._add_info("sample", key_or_dict, value)
 
     def add_environment_info(self, key_or_dict, value=None):
         self._add_info("environment", key_or_dict, value)
 
     def add_instrument_info(self, key_or_dict, value=None):
-        self._add_info("instrument", key_or_dict, value)
+        self._add_info("instruments", key_or_dict, value)
 
     def add_dataset_info(self, key_or_dict, value=None):
-        self._add_info("data_level", key_or_dict, value)
+        self._add_info("datasets", key_or_dict, value)
 
     def _add_info(self, category, key_or_dict, value):
         """Internal helper method to add information to a category."""
@@ -352,13 +352,23 @@ class MetadataHarvester:
             "parent_files": self.parent_files,
             "metadata": self.metadata
         }
+    
+    def print_metadata(self):
+        print("parent_files", self.parent_files)
+
+        for key in self.metadata.keys():
+            print(key,'metadata:\n')
+            for item in self.metadata[key].items():
+                print(item[0],item[1])
+
+
 
     def clear_metadata(self):
         self.metadata = {
-            "samples": {},
+            "sample": {},
             "environment": {},
-            "instrument": {},
-            "dataset": {}
+            "instruments": {},
+            "datasets": {}
         }
         self.parent_files = []