CISD and CISM have been around since the early 1990s, but to my knowledge there have not been any valid and reliable tools to measure the effect or outcome of these interventions.
Although I don't know of any measures specific to CISD/CISM, a basic symptom inventory may be helpful such as the BSI.
I have heard reports that CISD may be ineffective of harmful. The debate about this continues. Below are a few links to summaries of this debate. The first one has a good bibliography that might be useful:
http://www.houd.info/CISD.pdf
http://www.psychotherapybrownbag.com/psychotherapy_brown_bag_a/2010/09/critical-incident-stress-debriefing-ineffective-treatment-or-part-of-a-well-balanced-breakfast.html
Also, you might contact the International Critical Incident Stress Foundation for information on how to assess efficacy:
http://www.icisf.org/
Thanks John! Yes, I very much aware of the rather nasty debate going on in this field & trying to stay out of that quicksand..... And have been talking with folks like George Everly, Bob Vanderpol, Gary Defraia etc.... and have quite a few articles already.... and yes, will speak with CIS Foundation as well.... but really trying to sort out if anyone has attempted to develop a measurement tools to prove efficacy of these interventions, so would love for you to keep your ears open... Thanks for this answer & Pointers!
Critical incident stress management (Cism): A review of the literature
George S Everly Jr.a, , Raymond B Flannery Jr.b, Jeffrey T Mitchellc
Aggression and Violent Behavior
Volume 5, Issue 1, January–February 2000, Pages 23–40
I work with children who have been exposed to trauma.I use the UCLA PTSD Index for the DSM V for pre and post treatment. I am not doing CISD/CISM, but I would think where children were concerned, this would be useful. There is also a self report that was used by the military while still in the combat zone: http://www.cs.amedd.army.mil/AMEDDJournal/2008julsep.pdf
Hello and although this does not directly address the question, I suggest that reading the Cochrane Collaboration review on this might be helpful to you (it provides a systematic review of the literature). Psychological Debriefing for Preventing PTSD (Rose, Bisson and Wessely). I am a co-author.