This is something that is as diverse amongst active groups as there are number of active groups. Some claim to be demonologist while others claim to be psychic investigators. Specialties within the paranormal are akin to which field of medicine you want to study. Well maybe not quite that diverse, but there are certain “branches” within the paranormal community.
What does this mean? If you are a potential client of a paranormal group that is searching for some help on the internet, you can easily be drawn into a group or philosophy that may not be what you need or what you are looking for. Stated in the doctor analogy, you will not go to a brain surgeon for chest congestion. You don’t need that level of exposure.
If you are having any paranormal activity in your home or business look for a reputable group in your area. Check references if they will make them available. One minor thing to look for that I believe is currently over looked by many groups; will they refer you to another organization if they cannot help you?
There are the normal hauntings out there that most groups deal with very well. Then there are those that are escalated and could be something more than just angry Uncle Walter. If a group is in your home and they don’t understand how to handle that situation, they will put you and your family in a dangerous situation. Every group out there must know their own limitations and know who they can get when those limitations have been reached.