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.
Borderline personality disorder (BPD) is a condition characterized by difficulties in regulating emotion. This difficulty leads to severe, unstable mood swings, impulsivity and instability, poor self-image and stormy personal relationships.