Footleg In my experience only Martins method (border line completely independent of wall (or other) lines) results in a scrap that will be resilient to future edits. It is the only method I use now, after some bad experiences. Firstly an independent border stands out as an entity to any future author (although perhaps is a little messy). It is not hidden in the drawing. Secondly and most importantly, the creation of an area adds an id to any lines that make up its border. If in future a wall that also happens to be part of a border is split or redrawn, the id is removed (at least for one part of the line) and there is a very high chance that the area will no longer be drawn. I have alluded to this in http://therion.speleo.sk/wiki/doku.php?id=drawingchecklist#scrap_drawing Bruce _____ From: therion-bounces@speleo.sk [mailto:therion-bounces@speleo.sk] On Behalf Of Footleg Sent: Wednesday, 22 February 2012 3:56 a.m. To: List for Therion users Subject: Re: [Therion] Recommendations for the best way to define areas Yes, in that third alternative you do not need to include the walls in the area at all. They just clip the area fill drawn over the top of the passage. But which of these 3 methods is preferred? Or is there no real problem with any of them? I am asking because I am giving a training course next month and want to give the best advice. Footleg