The PMI- Project Management Institute published on December 31, 2008 the fourth version of the PMBOK- Project Management Body of Knowledge in English language. This version replaces in its entirety the third version. There is a transition period to present the certification examinations up to June 30, 2009 in which exams must be presented based on Version 3. From July the 1st on all certifications will be based on Version 4.