There is definite merit in all of the cult control techniques that have been mentioned. it is my belief, however, that the number 1 technique has yet to be mentioned.
FEAR
Fear of annihilation, or eternal cutting-off (sounds like a Bobbit trick!) at Armageddon. If you are not nestled safely in the arms of 'mother' when the big A comes, you've had it. And, even worse, so have your innocent children, who will no longer come under your protection. To lose a child is every parents' worst nightmare. This fear alone can cause a person to put aside doubts.
Fear of shunning in the event of disfellowshipment - for many witnesses have no friends outside the society. This is even worse of course for those whose families comprise mainly JW's.
Fear of your friends and family! yes, just like in Orwell's '1984', or Hitler's Third reich, they are all potential spies and backstabbers. Witnesses are ENCOURAGED and told they they will themselves be BLOODGUILTY if they don't dob in to the elders anyone who may have confided in them anything untheocratic or slightly suspect (such as doubts about 'big mother').
FEAR that you are not doing enough, that you are not absolutely, 100% , whole-souled, in Jehovah's sacred service. Nobody is assured of salvation, and less than 100%+ will mean that you are BLOODGUILTY and sure to die when the big a comes.
FEAR FEAR FEAR
No wonder they are such joyful people.
greetings from DaveDownunder (now living without fear).