A pproval plans have been considered an efficient and cost-effective way for libraries to acquire books in large quantities across many disciplines. Through approval plans, vendors supply current imprints as well as notification slips or forms to libraries on the basis of selected publisher output, subject profiles, and nonsubject categories such as readership level, country of origin, and format. When combined, these factors determine the parameters for selecting titles within the approval plan. Approval plan profiles can be limited by any number of factors, including price, scope, format, audience, language, and publisher. Each approval plan's profile is carefully established by library subject specialists to meet the research, curricular, and learning needs of the library's users.If a library commits to purchase large quantities of books on approval, vendors may offer substantial discounts off the list price. Libraries also may have the option to return titles that they consider outside of the approval profile. Additional vendor services include shelf-ready services, such as cataloging, bar Approval Plan Profile Assessment in Two Large ARL Libraries