Originally conceived when I was at Cisco, Just Good Enough Risk Rating (JGERR) is a lightweight risk rating approach that attempts to solve some of the problems articulated by Jack Jones’ Factor Analysis Of Information Risk (FAIR). FAIR is a “real” methodology; JGERR might be said to be FAIR’s “poor cousin”.
FAIR, while relatively straightforward, requires some study. Vinay Bansal and I needed something that could be taught in a short time and applied to the sorts of risk assessment moments that regularly occur when assessing a system to uncover the risk posture and to produced a threat model.
Our security architects at Cisco were (probably still are?) very busy people who have to make a series of fast risk ratings during each assessment. A busy architect might have to assess more than one system in a day. That meant that whatever approach we developed had to be fast and easily understandable.
Vinay and I were building on Catherine Nelson and Rakesh Bharania’s Rapid Risk spreadsheet. But it had arithmetic problems as well as did not have a clear separation of risk impact from those terms that will substitute for probability in a risk rating calculation. We had collected hundreds of Rapid Risk scores and we were dissatisfied with the collected results.
Vinay and I developed a new spreadsheet and a new scoring method which actively followed FAIR’s example by separating out terms that need to be thought of (and calculated) separately. Just Good Enough Risk Rating (JGERR) was born. This was about 2008, if I recall correctly?
In 2010, when I was on the steering committee for the SANS What Works in Security Architecture Summits (they are no longer offering these), one of Alan Paller’s ideas was to write a series of short works explaining successful security treatments for common problems. The concept was to model these on the short diagnostic and treatment booklets used by medical doctors to inform each other of standard approaches and techniques.
Michele Guel, Vinay, and myself wrote a few of these as the first offerings. The works were to be peer-reviewed by qualified security architects, which all of our early attempts were. The first “Smart Guide” was published to coincide with a Summit held in September of 2011. However, SANS Institute has apparently cancelled not only the Summit series, but also the Smart Guide idea. None of the guides seem to have been posted to the SANS online library.
Over the years, I’ve presented JGERR at various conferences and it is the basis for Chapter 4 of Securing Systems. Cisco has by now, collected hundreds of JGERR scores. I spoke to a Director who oversaw that programme a year or so ago, and she said that JGERR is still in use. I know that several companies have considered and/or adapted JGERR for their use.
Still, the JGERR Smart Guide was never published. I’ve been asked for a copy many times over the years. So, I’m making JGERR available from here at brookschoenfield.com should anyone continue to have interest.