So.. I am having trouble with the differences with each.. Aspergers causes a lack of social skills and generally conversations from an aspie are about their interests and them because they don't know how to communicate the same as most people.. I've been diagnosed between Pervasive Developmental Disorder and Aspergers Syndrome.. I have very little "common sense".. Very Asperger / autistic traits.. And in school I got a lot of help in Language Arts because I couldn't use words to explain what I wanted to others in detail.. I also got a lot of speech therapy work.. But I see a lot of similarity in Borderline to Aspergers.. Being the social components mostly.. Though I'm not sure.. Generally Aspergers is something you are born with.. and I'm not sure about Borderline.. But it is said generally to be from traumas.. I'm not sure if anyone can see there are some similarities in the two..I just find that interesting.. (similarities marked in bold) Aspergers Syndrome: -main symptom is significant trouble with social situations. -Not pick up on social cues and may lack inborn social skills, such as being able to read others' body language, start or maintain a conversation, and take turns talking. -Dislike any changes in routines. -Appear to lack empathy. -Be unable to recognize subtle differences in speech tone, pitch, and accent that alter the meaning of others’ speech. So your child may not understand a joke or may take a sarcastic comment literally. And his or her speech may be flat and hard to understand because it lacks tone, pitch, and accent. -Have a formal style of speaking that is advanced for his or her age. For example, the child may use the word "beckon" instead of "call" or the word "return" instead of "come back." -Avoid eye contact or stare at others. -Have unusual facial expressions or postures -Be preoccupied with only one or few interests, which he or she may be very knowledgeable about. Many children with Asperger's syndrome are overly interested in parts of a whole or in unusual activities, such as designing houses, drawing highly detailed scenes, or studying astronomy. They may show an unusual interest in certain topics such as snakes, names of stars, or dinosaurs -Talk a lot, usually about a favorite subject. One-sided conversations are common. Internal thoughts are often verbalized. -Have delayed motor development. Your child may be late in learning to use a fork or spoon, ride a bike, or catch a ball. He or she may have an awkward walk. Handwriting is often poor. -Have heightened sensitivity and become overstimulated by loud noises, lights, or strong tastes or textures. For more information about these symptoms, see sensory integration dysfunction. *A child with one or two of these symptoms does not necessarily have Asperger’s syndrome. To be diagnosed with Asperger’s syndrome, a child must have a combination of these symptoms and significant trouble with social situations.* Borderline Personality Disorder: -fear of being left alone (abandoned), even if the threat of being abandoned is not real. -Make frantic efforts to avoid real or imagined abandonment. -Have a pattern of difficult relationships caused by alternating between extremes of intense admiration and hatred of others -Have an unstable self-image or be unsure of his or her own identity. -Act impulsively in ways that are self-damaging, such as extravagant spending, frequent and unprotected sex with many partners, substance abuse, binge eating, or reckless driving. -Have recurring suicidal thoughts, make repeated suicide attempts, or cause self-injury through mutilation, such as cutting or burning himself or herself. -Have frequent emotional overreactions or intense mood swings, including feeling depressed, irritable, or anxious. These mood swings usually only last a few hours at a time. In rare cases, they may last a day or two. -Have long-term feelings of emptiness. -Have inappropriate, fierce anger or problems controlling anger. The person may often display temper tantrums or get into physical fights. -Have temporary episodes of feeling suspicious of others without reason (paranoia) or losing a sense of reality. Similarities: It seems to me that both have a lot of social difficulty and trouble with empathy.. They also seem to have both very strong emotions / feelings / sensitivities..