I've just uploaded this release to http://www.pogner.demon.co.uk/components/bc/ New components are Maps and AVL Trees. I have reworked the Iteration scheme; one obvious result is that iterating over Lists is much faster. Another is that this release WILL NOT WORK WITH GNAT 3.10p (hence the inordinate delay since the last release!) 3.11p is fine, as is OA 7.1 with restrictions (I've included special versions of the test programs, as *_aonix.adb). -Simon