I think SID stands for "Sensory Integration Dysfunction", doesn't it? I can't recall for certain. It is also known as Sensory Processing Disorder (SPD), the latest name and also the one that will most likely be the official name once the disorder gets in the DSM (it is the name the ppl who are trying to get it into the DSM are using). So, if you look it up, look up SPD first and then SID if you need more info. There are also even older names for it, like SDI (I forget what that stands for). Lots of names to choose from, LOL!