The State-Trait Anxiety Inventory for Adults™ (STAI-AD) is the definitive instrument for measuring anxiety in adults. It differentiates between the temporary condition of ‘state anxiety’ and the more general and long-standing quality of ‘trait anxiety’. It helps professionals distinguish between a client’s feelings of anxiety and depression. The inventory’s simplicity makes it ideal for evaluating individuals with lower educational backgrounds. Adapted in more than forty languages, the STAI is the leading measure of personal anxiety worldwide. The STAI has forty questions with a range of four possible responses to each.