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 â Causes, Symptoms, Treatment. Borderline personality disorder (BPD) is a mental disorder, which is characterized by impulsiveness, emotional instability, increased anxiety, episodes of anger, difficulties in building long-lasting relationships with other people, alternation of idealization and depreciation.