ARK TEST INVENTORIES Two types of test inventories are available. The MDBI Interest Inventory based on Prediger’s theory and RIASEC Inventory using Holland’s theory.Both are paper and pencil tests and are simple and easy to administer. Purchase Test Inventories Add to cart Career Preference - Career TestRM37.00 Add to cart MDBI Interest testRM100.00 Add to cart RIASEC Career TestRM200.00