diff --git a/src/environments/groupthm.pysty3 b/src/environments/groupthm.pysty3
new file mode 100644
index 0000000..82dc19a
--- /dev/null
+++ b/src/environments/groupthm.pysty3
@@ -0,0 +1,80 @@
+__HEADER__(Grouping theorems for easier customization.)
+
+
+\ExplSyntaxOn
+
+\RequirePackage{amsthm}
+\RequirePackage{thmtools}
+
+
+
+\cs_new:Nn \declaretheorem:nn
+{
+  \declaretheorem [ #1 ] { #2 }
+}
+
+\cs_generate_variant:Nn \declaretheorem:nn {V V}
+
+
+\keys_define:nn { groupthm / theoremgroup }
+  {
+    postname     .tl_set:N   = \l_groupthm_postname_tl,
+    prename      .tl_set:N   = \l_groupthm_prename_tl,
+    mapname      .tl_set:N   = \l_groupthm_mapname_tl,
+    thmtools     .tl_set:N   = \l_groupthm_thmtools_tl
+  }
+
+
+\clist_new:N __PACKAGE_MACRO__(thmtools_args)
+
+\keys_define:nn { groupthm / groupedtheorem }
+{
+  thmtools       .clist_set:N    = __PACKAGE_MACRO__(thmtools_args_clist),
+  group          .clist_set:N    = __PACKAGE_MACRO__(groups_clist),
+  name           .tl_set:N       = __PACKAGE_MACRO__(theorem_name_tl),
+  name           .default:n      = \q_no_value
+}
+
+\NewDocumentCommand{\NewGroupedTheorem}{o m}
+{
+  \keys_set:nn { groupthm / groupedtheorem } { #1 }
+  \RemoveFromHook
+  \UseHook
+  
+
+  % Construct name
+  \str_new:N \__name_str
+  \str_set:Nx \__name_str
+    {
+      \quark_if_no_value:NTF __PACKAGE_MACRO__(theorem_name_tl)
+        {
+          \text_titlecase_first:n {#2}
+        }
+        {
+          \tl_use:N __PACKAGE_MACRO__(theorem_name_tl)
+        }
+    }
+
+  % Process groups here, adding to the hooks for prename, postname, mapname, thmtools
+  % mapname currently not implemented
+
+%  \clist_new:N __PACKAGE_MACRO__(mapname_clist)
+%  \clist_set:N
+
+    \str_put_left:Nx \__name_str
+      {
+        \UseHook { groupthm / prename }
+      }
+    \str_put_right:Nx \__name_str
+      {
+        \UseHook { groupthm / postname }
+      }
+
+  \declaretheorem:VV
+  {
+    __PACKAGE_MACRO__(thmtools_args_clist)
+  }
+  { \__name_str }
+}
+
+\cs_new: