Well, I'll probably be "other". Sometimes, I'll do the border first. Other times I'll first sort the pieces into things that probably belong to each other. But it will largely depend on the picture - it's much easier to sort a picture of three different coloured dogs taking up most of the frame, than say, a view of the sea with mostly water and sky (I'll just make a pile of (mostly) blue pieces ... time passes ... I only have three pieces in my non-blue pile). Most of the time, I'll just won't do it. ;-)

As for getting conflicts when people have to make a puzzle together, well, the puzzle has only *120* pieces. That's 10 x 12 pieces. That's childs play! Doing a 120 puzzle with 2 adults is like having 2 people work together to swap a backup tape (and then observing "extreme behaviour" if one person pulls out the tape alone).

Let them make a 5000 piece puzzle.