This document discusses the importance and development of vocational interest inventories (VII). It notes that VII aim to help individuals identify careers that match their personalities, abilities, and interests in order to find satisfying and successful work. The document outlines John Holland's influential theory that categorized interests and careers into six types. It then discusses key assumptions about VII, such as the idea that interests remain stable over time. Different approaches to measuring interests are presented, as well as positive characteristics that effective VII should possess. Finally, some widely used VII are described briefly, including the Strong Vocational Interest Blank and Strong-Campbell Interest Inventory.