diff --git a/ndsl/initialization/grid_sizer.py b/ndsl/initialization/grid_sizer.py
index f3347e27..684fa5ab 100644
--- a/ndsl/initialization/grid_sizer.py
+++ b/ndsl/initialization/grid_sizer.py
@@ -1,9 +1,10 @@
+from abc import ABC, abstractmethod
 from collections.abc import Sequence
 from dataclasses import dataclass
 
 
 @dataclass
-class GridSizer:
+class GridSizer(ABC):
     nx: int
     """Length of the x compute dimension for produced arrays."""
     ny: int
@@ -15,11 +16,11 @@ class GridSizer:
     data_dimensions: dict[str, int]
     """Name/Lengths pair of any non-x/y/z dimensions, such as land or radiation dimensions."""
 
-    def get_origin(self, dims: Sequence[str]) -> tuple[int, ...]:
-        raise NotImplementedError()
+    @abstractmethod
+    def get_origin(self, dims: Sequence[str]) -> tuple[int, ...]: ...
 
-    def get_extent(self, dims: Sequence[str]) -> tuple[int, ...]:
-        raise NotImplementedError()
+    @abstractmethod
+    def get_extent(self, dims: Sequence[str]) -> tuple[int, ...]: ...
 
-    def get_shape(self, dims: Sequence[str]) -> tuple[int, ...]:
-        raise NotImplementedError()
+    @abstractmethod
+    def get_shape(self, dims: Sequence[str]) -> tuple[int, ...]: ...