diff --git a/volia/__init__.py b/volia/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/volia/data_io.py b/volia/data_io.py
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--- /dev/null
+++ b/volia/data_io.py
@@ -0,0 +1,44 @@
+'''
+Data management input/output
+'''
+
+# Import packages and modules
+import numpy as np
+
+# Defining some types
+from typing import List, Dict
+KeyToList = Dict[str, List[str]]
+KeyToFeatures = Dict[str, List[float]]
+
+
+def read_lst(file_path: str) -> KeyToList:
+    '''
+    Read lst file with this structure:
+    [id] [value1] [value2] ... [value n]
+
+    This is a basic function reused by others like read_features.
+    returns a dictionary with id as key and a list of value as corresponding values
+    '''
+    # KeyToList type variable
+    key_to_list = dict() 
+    with open(file_path, "r") as f:
+        for line in f:
+            splited = line.replace("\n", "").split(" ")
+            id = splited[0]
+            values = splited[1:]
+            key_to_list[id] = values
+    return key_to_list
+
+
+def read_features(file_path: str) -> KeyToFeatures:
+    '''
+    '''
+    # KeyToFeatures type variable
+    key_to_features = dict()
+    # and the KeyToList
+    key_to_list = read_lst(file_path)
+    
+    for key_, list_ in key_to_list.items():
+        key_to_features[key_] = np.asarray(list_, dtype=float)
+
+    return key_to_features
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