Letters to the Editor. Recent HBR articles generate comments from Allen Rosen shine, Marc Porat, Barry W. Sullivan, T. Michael Glenn, Edward McCracken and David Bagshaw, Jeffrey Pfeffer, Vernon Ellis, James P. Womack, and Jay W. Lorsch.

The fundamental goal of every business should be to achieve the full profit potential of each customcr relationship, argue Alan W.H. Grant and Leonard A. Schlesinger in "Realize Your Customers' Full Profit Potential." But only today can companies use information and technology tools to optimize what the authors call the value exchange: the connection between a companys financial investment in customer relationships and the return that customers generate in responding to that investment.

Few managers of high-technology companies view manufacturingas a " primary source of competitive advantage. But Gary P. Pisano and Steven C. Wheelwright warn in "The New Logic of High-Tech R&D" that such thinking is often costly and potentially dangerous to the competitive health of high-tech Companies.