In two recent articles, in eWeek and SearchVB.com, it seems that Ivar Jacobson (one of the fathers of UML and RUP) has recently joined the Microsoft VSIP program. He is working on the Essential Unified Process (Essential UP) that is going to be integrated into Visual Studio 2005. Essential UP will be a more agile and lightweight development process based on good practices and principles of both MSF and RUP.