Version 3.1 of the INCOSE Systems Engineering Handbook remains the sole basis for the INCOSE CSEP/ASEP exam until further notice. An announcement will be made when Version 3.2 can also be used. For planning purposes, an exam update is currently scheduled for late April 2010, after which time both Version 3.1 and 3.2 may be used.
After January 2011, only Version 3.2 of the INCOSE Systems Engineering Handbook will be used as the basis for the certification exam, and Version 3.1 will be retired. This timing allows a transition period for those already using Version 3.1 of the handbook to prepare for the examination.