Software development takes place in a dynamic context of frequently changing technologies, and limited resources. Development teams world-wide are under ever-increasing pressure to deliver trustworthy software products more quickly and with higher levels of quality. At the same time, global competition is forcing software development organizations to cut costs by rationalizing processes, outsourcing part or all of their activities, reusing existing software in new or modified applications and evolving existing systems to meet new needs, whilst still minimizing the risk of projects failing to deliver. To address these difficulties, new or modified processes are emerging including lean and agile methods, plan-based product line development, and increased integration with systems engineering processes. For ICSP 2009, articles addressing process support to develop trustworthy software are of particular interest.