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. Borderline personality disorder is a longstanding pattern of swings -- in moods, relationships, self-image, and behavior. People with borderline personality disorder have very strong emotions and often try to hurt themselves, and may have problems with relationships with people.