Which personality disorder is characterized by a preoccupation with orderliness and perfection at the expense of flexibility and efficiency?

The personality disorder characterized by a preoccupation with orderliness and perfection at the expense of flexibility and efficiency is indeed Obsessive Compulsive Personality Disorder (OCPD). Individuals with OCPD demonstrate an excessive focus on order, rules, and control, which can lead to difficulties in adapting to new situations or being open to change. This rigidity often interferes with their personal and professional relationships, as they may prioritize their need for perfection and order over collaboration or spontaneity.

OCPD differs from Obsessive-Compulsive Disorder (OCD) as it is more about personality traits rather than intrusive thoughts or compulsions. People with OCPD might take pride in their meticulousness and may see their behaviors as desirable or necessary, often leading to interpersonal conflicts when others do not share their standards.

In contrast, avoidant personality disorder is marked by social inhibition and feelings of inadequacy; narcissistic personality disorder involves a preoccupation with self-importance and a lack of empathy; and dependent personality disorder features a pervasive and excessive need to be taken care of, resulting in submissive and clingy behaviors. None of these conditions share the same specific fixation on orderliness and perfection as seen in OCPD.