This bridge book concentrates on the essential elements of constructive bidding - the basic structure of any 4-card major system - with the emphasis on a weak no-trump. The book adopts a step-by-step approach which has been developed over the years in teaching weekends and bridge cruises. It is targeted at intermediate players, who may have completed a couple of bridge courses and would like to improve, and at those who have played duplicate bridge for a number of years but feel that they never seem to make much progress.