While most DIDers do not know that their alters exist at first, they are aware that some thing is not right with them or within them (I knew this at age 12 - dx at age 30)... and their are some DIDers like me that they are 90% aware of what their alters do, but we are not able to stop them.

IMO - I say the reason for T is to integrate your alters as much as you can so you can get back to the original YOU the YOU that was born - ONE!

I went from having 15 different alter (and a few small pieces) to just me and my close counter part Carol..... I could not have done this without eight straight years of T.