A Directive to Physicians and Family or Surrogates (sometimes called a "Directive" or "Living Will") evidences your intentions whether to withhold or continue life sustaining treatment in the event you have an "irreversible condition" or a "terminal condition." However, if you want the agent named in your Medical Power of Attorney to control the decision to either withhold or continue life sustaining treatment, you do not need a Directive. This is because, whenever you do not have a Directive, Texas law gives this authority to the agent under your Medical Power of Attorney. If you do not want your Medical Power of Attorney agent to have the authority (and you want to specify your preferences in writing), you do need a Directive. The Directive applies only if you are otherwise unable to communicate your wishes. It may be revoked by you at any time. The information statement attached to the Directive provides additional details as to its purpose and effect.