In using this tool, practitioners must never lose sight of the fact that models need continued care and feeding to keep them in line with the latest knowledge, and parameters need to be set with due regard for low-probability events that may not be adequately addressed in recent data.
Practitioners need to keep in mind that rare events implicit in the tails of distributions will occasionally occur. The critics  4  BIS Review 85/2001  don’t seem to mention perhaps the biggest risk of the increasing importance of models: the lulling of the users into a false sense of well-being that loses sight of these potential tail events.