Living Wills: Written, witnessed declarations in which persons request that if they become disabled beyond reasonable expectation of recovery, they be allowed to die rather than be kept alive by extraordinary means. (Bioethics Thesaurus)Wills: Legal documents that are declarations of individuals' wishes regarding the disposal of their property or estate after death; esp: written instruments, legally executed, by which dispositions are made of estates. LIVING WILLS are written declarations regarding prolongation of life by extraordinary means.Right to Die: The right of the patient or the patient's representative to make decisions with regard to the patient's dying.Mental Competency: The ability to understand the nature and effect of the act in which the individual is engaged. (From Black's Law Dictionary, 6th ed).Advance Directives: Declarations by patients, made in advance of a situation in which they may be incompetent to decide about their own care, stating their treatment preferences or authorizing a third party to make decisions for them. (Bioethics Thesaurus)Attitude to Death: Conceptual response of the person to the various aspects of death, which are based on individual psychosocial and cultural experience.Withholding Treatment: Withholding or withdrawal of a particular treatment or treatments, often (but not necessarily) life-prolonging treatment, from a patient or from a research subject as part of a research protocol. The concept is differentiated from REFUSAL TO TREAT, where the emphasis is on the health professional's or health facility's refusal to treat a patient or group of patients when the patient or the patient's representative requests treatment. Withholding of life-prolonging treatment is usually indexed only with EUTHANASIA, PASSIVE, unless the distinction between withholding and withdrawing treatment, or the issue of withholding palliative rather than curative treatment, is discussed.Personal Autonomy: Self-directing freedom and especially moral independence. An ethical principle holds that the autonomy of persons ought to be respected. (Bioethics Thesaurus)Terminal Care: Medical and nursing care of patients in the terminal stage of an illness.Palliative Care: Care alleviating symptoms without curing the underlying disease. (Stedman, 25th ed)