I have been asked on numerous occasions what the difference is between the Scientology religion and the Dianetics technology.

Here's the best way I know to describe the difference:

• Dianetic techniques address what the spirit is doing to the body. It deals with such things as pains, emotional problems such as antagonism, grief, feeling stressed-out, anxious, depressed. It can handle the feeling of loss one experiences at the death of a loved on or the end of a relationship. That is why Dianetics is so perfectly suited to trauma relief, especially since it is very easy to learn the simplest Dianetics techniques. In fact it is common for people to simply read the Dianetics book and then find a partner to work with. Scientology churches, missions and groups offer Dianetics workshops
• Scientology, on the other hand, deals with the being - the person himself or herself - helping the individual increase ability and intelligence and

There are good descriptions of both Scientology and Dianetics here:

What is Scientology?

What is Dianetics?