There are always some complicating constraints such as time, schedules, weather, personal health, breakdowns, regulations, complaining customers and the list goes on and on. You never know what you will face until you are out there. Still, you must make some decisions and do the job, or you will soon be out of a job. Stress Trees are living systems. Every living system will do something when its survival is threatened.
Trees are systems that came from genetic codes.
The systems do have limits. When any agent causes the system to operate near its limits, then the system becomes stressed. When the potential survival - threatening agent continues to exert a force, then the tree system could go from stress to strain. Any system is threatened when it is forced to operate near its limits. When the threatening force is continued, the likelihood of the system stopping increases.