If all the top-level possibilities I can
think of are not relevant, if they are inadequate and insufficient to explain
everything, if they are the symptoms as opposed to the cause, then I will move down
a level to more subtle possibilities.
If these too do not provide a full and satisfactory
explanation, I will go lower still.
For example, if someone acts unprofessionally
and out of character and causes a lot of damage to the company they work for, I
would first check for such personal factors as illness, money worries, family
problems or a drink problem. I would then look at the employer and the job and to
see whether they were tired from working very long hours, were living in fear
of redundancy or had been promoted beyond their capabilities.