I Finished SCJP,SCWCD.Now i am preparing foe SCBCD.I gone through the HeadFirst series of Bussiness Component Developer 2 times.but there is gap in "examObjective" between the HeadFirst SCBCD Book and the Sun Site.IN Sun site i found JAVA Persistence API as the one of the exam objective but in head first it was not there. And what is the Diff Between CX-310-091 and CX-310-092. I heard a news that 310-092 is only for who finished any previous version of BCD. is it Correct..? i am in a coufusion..