diff --git a/optas/models.py b/optas/models.py
index 78c2a93a..cb12a1e9 100644
--- a/optas/models.py
+++ b/optas/models.py
@@ -1,5 +1,6 @@
 """! @brief Several Model classes are defined."""
 import os
+import warnings
 import functools
 import pathlib
 
@@ -52,6 +53,29 @@ def listify(*args, **kwargs):
     return listify
 
 
+def deprecation_warning(name_to):
+    def decorator(function):
+        def wrapper(*args, **kwargs):
+            name_from = function.__name__
+            warn = f"'{name_from}' will be deprecated, please use '{name_to}' instead"
+            msg = "\033[93m" + warn + "\033[0m"  # add
+            warnings.warn(msg, DeprecationWarning, stacklevel=2)
+            self_ = args[0]
+            new_function = getattr(self_, name_to)
+            while hasattr(new_function, "__wrapped__"):
+                new_function = new_function.__wrapped__
+
+            args_use = list(args)
+            if function.__name__.endswith("_function"):
+                args_use = args_use[1:]
+
+            return new_function(*args_use, **kwargs)
+
+        return wrapper
+
+    return decorator
+
+
 class Model:
     """! The Model base class.
     Defines the base class utilized by all models.