The simple argument, the COO is responsible as CMO and CTO functions reporting into the COO are effectively combined with design to form the basis for timely development. HOWEVER shifts have begun to emerge in many firms where positions such as the Head of Global Product Development are being offered seats at the board for the simple purpose of expanding the often limited scope of the 6mo, 1yr, and 2yr strategic plans typical when COO, CTO and CMO discussions are had at the board level. This ISDA article on Design in the Boardroom sets a good indication of how this is happening.