diff --git a/OpenNest.Engine/PartSortOrder.cs b/OpenNest.Engine/PartSortOrder.cs
new file mode 100644
index 0000000..61d4826
--- /dev/null
+++ b/OpenNest.Engine/PartSortOrder.cs
@@ -0,0 +1,8 @@
+namespace OpenNest
+{
+    public enum PartSortOrder
+    {
+        BoundingBoxArea,
+        Size,
+    }
+}