This paper investigates how people's happiness depends on their current activities and on time. We conducted an hourly web survey, in which 70 students reported their happiness every hour on one day every month from December 2006 to February 2008. This method is an extension of the experience...

Software platforms are a critical component of the computer systems underpinning leading edge products ranging from third generation mobile phones to video games. After describing some key economic features of computer systems and software platforms, the paper presents case studies of personal...