Following the rules set out in the DSM definition, clinicians refer to a list of criteria and must identify five of them in a patient to make a diagnosis. This "Chinese menu" approach is typical of the DSM system. However, the manual fails to specify any core features, without which a diagnosis should not be made...The problem is that any combination of five symptoms gives the diagnosis, even if not all domains are represented. In addition, there are no core symptoms for diagnosis...BPD is a complex syndrome that cannot be defined by a limited number of criteria."
I suggest...that because BPD is a multidimensional disorder and patients have symptoms in multiple shperes (mood instability, impulsivity, unstable relationships, and cognitive impairments), the presence of all these features should be required to make a diagnosis.