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 See separate article Borderline Personality Disorder and NICE guidance. The important feature of borderline personality disorder is a pervasive pattern of unstable and intense interpersonal relationships, self-perception and moods.