The Washington Guardianship Inventory (WEI) is a standardized, evidence-based tool used to assess guardianship decision-making capacity in individuals with intellectual and developmental disabilities. It is designed to be used in guardianship proceedings in Washington State, as well as in other states. The WEI consists of seven dimensions that measure an individual's ability to make decisions about their own health, safety, finances, and other important aspects of life. The seven dimensions include: Understanding and Appreciation, Preference Formation, Ability to Communicate, Assessing Risk, Self-Control, Problem-Solving, and Self-Care. The Washington Guardianship Inventory is typically administered by a trained professional, such as a psychologist or social worker, and it can be used in conjunction with other evaluation tools. There are two versions of the WEI: the short form and the long form. The short form consists of 12 items, while the long form consists of 25 items. Both versions of the WEI provide a reliable and valid measure of an individual's decision-making capacity in various domains.