A study examined the collection of 27 interest and values instruments in the review chapters of the third edition of "A Counselor's Guide to Career Assessment Instruments" (Kapes, Mastie, and Whitfield 1994) to determine their commonalities and differences. The instruments were described and compared on these sets of characteristics: name of instrument; publisher; date of recent edition; intended population; number of scales; homogeneous or empirical keying; normative or ipsative scoring; time to administer; machine or hand scoring availability; computer-based version availability; types of scores reported; cost of individual test; references to reviews; and brief descriptions. The categories of information showed a wide variety of differences among the instruments. Although most instruments were intended for high school and college students, many were applicable to adults. The number of scales ranged from 6 to 246. Homogenous keying with normative scoring was most common. Administration time ranged from as little as 10 minutes to over 1 hour. Most instruments could be machine scored. Fewer than half were computer based. Percentiles and standard scores were the most common scores reported. Costs per test ranged from as little as 18 cents to over $22. (A table illustrates the 14 categories of information available for each instrument.) (YLB)