During the short warm-up in doubles play, what routines do you follow to help assess a player's weaknesses. I can think ball feeds might include heavy topspin groundies, under spin and maybe high loopy shots to both the forehand and backhand. Maybe vary with some deep vs short shots to see their court coverage. At the net, test both wings with various high vs low shots. Overheads to both wings etc. would appreciate any insights on this crucial but overlooked part of my game.