Uses empirical data from an obtrusive study of reference performance to explore the content validity of and assumptions about unobtrusive studies. Changes needed to improve unobtrusive studies of reference services are discussed, including the development of test questions representing all types of queries and supplementing the correct fill rate…

A computerized presentation explaining how to use the library online catalog (NOTIS) was produced at Texas A&M University. A study using students in first-year composition courses verified that students who viewed the presentation were able to use the online catalog more effectively than those who did not, especially for subject searching. (12…