I am working my way through Mike Lawrence'd instructional CD on 2/1. I see that he recommends the use of invitational JS at the 3 level . That is 1X- 3Y where Y is a lower ranking suit. Applies when X is majors or diamonds. You have to give up Bergen raises and Mike usually gives the pros/cons of various treatments but does not say much on this issue other than you have to give up Bergen. Can anyone point me to an article, book that discusses this point. Also how common is the usage of invitational JS at the expert level? Ron