The Lisa was a major project at Apple, which reportedly spent more than $50 million on its development. More than 90 people participated in the design, plus more in the sales and marketing effort, to launch the machine. "BYTE" credited Wayne Rosing with being the most important person on the development of the computer's hardware until the machine went into production, at which point he became technical lead for the entire Lisa project. The hardware development team was headed by Robert Paratore. The industrial design, product design, and mechanical packaging were headed by Bill Dresselhaus, the Principal Product Designer of Lisa, with his team of internal product designers and contract product designers from the firm that eventually became IDEO. Bruce Daniels was in charge of applications development, and Larry Tesler was in charge of system software. The user interface was designed in a six-month period, after which, the hardware, operating system, and applications were all created in parallel.