In environmental science, experimental design is an extremely important part of the scientific method. When a scientist seeks to prove or disprove a hypothesis, he or she must carefully design the experiment so that it tests only one thing, or variable.
Borderline personality disorder (BPD), also known as emotionally unstable personality disorder, is a long term pattern of abnormal behavior characterized by unstable relationships with other people, unstable sense of self, and unstable emotions.
By Mayo Clinic Staff. Borderline personality disorder affects how you feel about yourself, how you relate to others and how you behave. Signs and symptoms may include: An intense fear of abandonment, even going to extreme measures to avoid real or imagined separation or rejection.