The truth is there is not definite criteria for any of them. The DSM IV-TR is simply a manual, offering guidelines to help mental health professionals categorize their patients. Categorization is not so much for the patient's sake, but for the researcher's sake, when they write about a disorder in the scientific literature. In reality the symptomatic differences between Bipolar Disorder and Borderline P.D. are so few and far between that it's nearly impossible to differentiate between the two (essentially the only difference is that borderlines are considered more likely to self-harm). ADD is a common comorbid disorder seen with many other diagnoses. I find that trying to fit oneself into a specific corner is a waste of time. We don't belong in any specific corner, we belong anywhere we feel we do.