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.
1 Borderline personality disorder is a pervasive pattern of instability of interpersonal relationships, self-image, moods, and control over impulses. 2  Wide mood swings. 3  Inappropriate anger or difficulty controlling anger. 4  Chronic feelings of emptiness.