In the context of a disaster or a resource-poor environment, frustration may be defined as understanding what can be done, what needs to be done, and how to do it, but not having the necessary tools. Unlike paramedics, who are trained to expect the unexpected, most health care professionals (including physicians, dentists, podiatrists, physician assistants, and nurse practitioners) who work in high-tech health care systems don't expect that the power will fail, a fire will ignite, the computer system will crash, a facility will flood, or an epidemic will erupt. Yet these events occur on a routine basis and, given the state of the world, it is likely they will occur more frequently in the future.