this book constitutes the refereed proceedings of the 6th international conference on product focused software process improvement, profes 2005, held in oulu, finland in june 2005. the 44 revised full papers presented were carefully reviewed and selected and constitute a balanced mix of academic and industrial aspects. the papers are organized in topical sections on software process improvement, software quality, mobile and wireless applications, requirements engineering, industrial experiences, process analysis, process modeling, spi methods and tools, experimental software engineering, validation and verification, agile methods, and measurement.