Once the amount of alimony and child support have been established whether via Court or agreement, the person seeking to change those amounts would need to file a supplemental petition for modification. The person seeking the change whether to increase or decrease it would have to show the Court that there is a substantial change in circumstances which is material, permanent, and unanticipated. The idea is that people cannot come back to Court with the same facts and expect a different result. Therefore, a change needs to be proved to the Court. That change can be change in income, change in expenses, disability or any other life changing event. In order to determine if a change would assist in a modification, seek the advice of a professional family law attorney. Click here to read the entire article on A-Rod's case.