Although ABA does not work for every autistic child, it works for a higher percentage than any other therapy. We use ABA techniques for almost everything.

I would not offer a reward to stop the bad behavior, because you might accidentally reinforce the behavior. Try instructing him to do something that is incompatible with the behavior, and then rewarding him for doing that.

For example, one time, my son was having a "rolling-on-the-floor-eyes-closed" behavior. It was not a complete meltdown, so the therapist asked him to follow her to the other room to play a new game. She didn't specifically tell him to stop, but there was no way he could follow her without opening his eyes and getting up. Then, when he followed her, the reward was (in his mind) for following, not for rolling on the floor.

This is the classic example of a redirection, but it only works in some situations. For example if the behavior started as a way of avoiding work, then you have to re-introduce the work pretty quickly, or the behavior will be repeated each time he wants to avoid a task.

Honestly, ABA does not work all the time for my son. We have tried all kinds of therapies. Redirection and positive interaction, and the knowing of not-so-good consequences seem to be the three we use the most. I often feel as though I am a rodeo clown, distracting my child from the things that will cause a meltdown or inappropriate behavior. Of course, that does not help me in any way. The earlier you start teaching them what behaviors are expected the better off you are (that is just my opinion).
I have a Master's Degree in Psychology and it has helped me a lot, so I will pass on some things I know: The foundation for behavioral therapy is classical conditioning and operant conditioning. These are easy to Google - they both work sometimes. I know that Systematic Desensitization has worked some for my son. This is used for fears - phobias - your child may have. For example, my son was very afraid of large crowds, so we used this to calm him down and now he does not seem to mind crowds so much. Aversion therapy helps too, and we do it everyday without even knowing we do it. For example, if you go to a restaurant and order a certain food item and you throw up after eating it, and now you will never order that food item again because you do not want to throw up. Just like a child might reach for a hot stove, get burnt, so therefore, the child associated hot things with pain so the child knows not the touch the stove again. Simple pairing of things like this work too, but in different ways.
Modeling may work if a child has an older sibling - older relative - whom he/she looks up to. Every kid wants to be like someone - even ours. Extinction is also another good one to stop behaviors. For example, if you stop reinforcing a behavior (ignore it) the child may realize they are not getting what they want and stop, or realize they are not getting the attention they want and stop.
Cognitive behavioral therapy (known as CBT) sometimes helps because it decreases anxiety type issues, but will regulate their emotions, develop impulse control, and improve their behavior as well. For example, a child's thought processes are changed to positive thoughts or manage their thoughts and emotions.
One other therapy we have used is Sensory Integration/Occupational Therapy - as my son has/had some sensory issues with sound and of course large crowds.
All of these therapies can be Googled or talked about with a therapist. Finding a therapist that takes your insurance is the first step. All therapists have basic trainings on different types of therapy, but I would ask him to suggest a therapist who is expert on or studies autism.

If ABA is not working for your child, the chances are very high that you are not with a high-quality ABA professional who knows how to access your child 's hidden intelligence and who can work past the behaviors that are impeding his or her growth. There is more "ABA" out there that is not high quality (behavior assistants trained in about a weekend and with no thorough schooling yet claiming to be ABA specialists) than there are high quality ABA specialists. If they have not gotten intensive schooling in Discreet Trial and even autism psychology, the ABA is most likely going to seem ineffective. I cringe when I hear parents say ABA didn't work for their autistic child. Please don't give up on it-- over 40% of autistic children are turned around with this time-proven method but it's only if it's done intensively (20-40 hours a week) by quality professionals. As parents in areas where there is only poor ABA such as in FL, it behooves us to learn as much as we can about doing ABA with out kids ourselves, as we know our kids' interests and idiosyncracies better than anyone who claims to be an expert but is not.

ABA Therapy...We've noticed so much positive changes in our son. Just make sure you find a therapist that's there to help not to get a paycheck. We've gone through so many therapist...you'll know which ones care and are truly there to help. Trust your mommy instinct. :)

Depends of the behavior. My boy is very sweet and happy but has energy outbursts gala Beavis and Buthead, lol where he squeezes and jumps. I have found that if I say "oh you want to hug?" and then give him a big tight squeeze, he calms down