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diff --git a/helm/software/lambda-delta/src/common/status.ml b/helm/software/lambda-delta/src/common/status.ml
new file mode 100644
index 000000000..3da988f84
--- /dev/null
+++ b/helm/software/lambda-delta/src/common/status.ml
@@ -0,0 +1,33 @@
+(*
+    ||M||  This file is part of HELM, an Hypertextual, Electronic        
+    ||A||  Library of Mathematics, developed at the Computer Science     
+    ||T||  Department, University of Bologna, Italy.                     
+    ||I||                                                                
+    ||T||  HELM is free software; you can redistribute it and/or         
+    ||A||  modify it under the terms of the GNU General Public License   
+    \   /  version 2 or (at your option) any later version.              
+     \ /   This software is distributed as is, NO WARRANTY.              
+      V_______________________________________________________________ *)
+
+module G = Options
+module Q = Ccs
+
+type status = {
+   delta: bool;  (* global delta-expansion *)
+   rt: bool;     (* reference typing *)
+   si: bool;     (* sort inclusion *)
+   expand: bool; (* always expand global definitions *)
+   cc: Q.csys;   (* conversion constraints *) 
+}
+
+(* helpers ******************************************************************)
+
+let initial_status () = {
+   delta = false; rt = false; 
+   si = !G.si; expand = !G.expand; cc = Q.init ()
+}
+
+let refresh_status st = {st with
+   si = !G.si; expand = !G.expand; cc = Q.init ()
+}
+