--- a/doc/overview.rst	Tue Mar 26 17:10:26 2024 +0100
+++ b/doc/overview.rst	Wed Apr 03 13:02:50 2024 +0200
@@ -1,10 +1,36 @@
-Project overview
-================
+Overview: IDE and runtime(s)
+============================
 
-In order to target the widest possible range of programmable devices and keep efficient, Beremiz use C code as an intermediate language. 
+..
+    TODO: take content from https://hg.beremiz.org/beremiz_docs/
 
-To be executed, C needs to be compiled. `GCC <http://gcc.gnu.org>`_ serve that purpose perfectly.
+PLCopen TC6 based Model-View-Controller Editor
+----------------------------------------------
 
-PLC program is expressed in languages defined in IEC-61131, including graphical languages. Thanks to PLCopen TC2, those graphical languages have a standardised representation, in XML.
+Toolchain
+---------
 
-To be continued.
+Runtimes
+--------
+
+Python runtime
+^^^^^^^^^^^^^^
+
+C runtime
+^^^^^^^^^
+
+Extensions
+----------
+
+Fieldbusses
+^^^^^^^^^^^
+
+HMI
+^^^
+
+I/Os
+^^^^
+
+Integration
+-----------
+