A Debt Management Plan is an informal agreement that is arranged on your behalf with your creditors to reduce your monthly debt payments. Normally you are still obliged to pay your debt in full, so reducing your monthly payments may increase your length of repayment.
There is no guarantee that the interest and charges will be stopped therefore your debt may continue to increase. It is important that you work with a debt management company who will act on your behalf to negotiate this, as well as making sure that you do not receive direct demands for payment.
Generally, debt management is suited to those with fairly low levels of debt. It offers a short term solution for people needing some time to get back on their feet or those struggling to manage their debt appropriately.