Maybe this is a silly question, but how exactly does one specialize in a particular area? My understanding has always been that this is mostly done at the post-doc level. However, if a person only chooses to do their practicas at particular sites/with specific populations, wouldn't this be specializing? I am on my first practica, at an addiction site, and would like to continue on this path. However, would I be limiting myself if I only chose practicas at addiction sites? I am still certainly encountering a wide variety of pathologies/co-morbid issues at these sites.