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. 1  Impulsive and risky behavior, such as having unsafe sex, gambling or binge eating. 2  Unstable or fragile self-image. 3  Unstable and intense relationships.  Up and down moods, often as a reaction to interpersonal 1  stress. Suicidal behavior or threats of self-injury.  Intense fear of being alone or abandoned.