Final answer:
Deciding that an individual's behaviors and mental processes are abnormal is essential because it is the first step toward labeling that person with a psychological disorder and providing treatment.
Step-by-step explanation:
Deciding that an individual's behaviors and mental processes are abnormal is essential because it is the first step toward labeling that person with a psychological disorder and providing treatment. This allows professionals to identify and help individuals who may be experiencing significant distress or impaired functioning due to their behaviors or mental processes.