Barriers and Issues 93 Summary of the Known and the Unknown 96 Contributions to the Field 97 3. Methodology 98 Research Methods Employed 98 Specific Procedures Employed 100 Formats for Presenting Results 126 Resources Used 127 Reliability and Validity 128 Summary 130 4. Results 131 Analysis of the Data 131 Responses from the Digital Reference Service Providers 132 Background Details on the Unobtrusive Study 150 Results of the Unobtrusive Study of Asynchronous Reference Services 151 Response Rate 155 Analysis of the Answers 155 Summary of Results 222 5. Conclusion, Implications, Recommendations, and Summary 225 Conclusions 225 Implications 249 Recommendations 251 Summary 261 Appendixes A. Methodology Workflow 272 B. Nova Southeastern University IRB Approval 276 C. Permission from IRCC 277 D. Permission from Library Administrators 278 E. IRB Adult/General Informed Consent [DRSP] 280 F. Checklist for Quality E-mail Reference Responses 282 G. Scoring Quality E-mail Reference Responses 285 H. Expert Panel 287 I. IRB Adult/General Informed Consent [student] 289 Reference List 292 vii List of Tables Academic Degree and Certificate Programs, the standards for the Western Cooperative for Educational Telecommunications (WCET) (1996), set the tenor for quality DL. A subsequent policy report from WCET is entitled the Principles for Electronic Campus Library Services (Southern Regional Education Board, 2002b). The Institute for Higher Education Policy (2000) included the provision of library services in its report, Quality on the Line: Benchmarks for Success in Internet-Based Distance Education. The American Library Association (ALA) and the National University Extension Association (1931) recognized inadequate services to extension students in 1931 when it published a report dealing with the need to support the library needs of DL students. ALA's (2004a) Guidelines for Distance Learning Library Services asserted the need for "equivalent" library support and services to all students no matter where their learning takes place (p. 1). Guidelines and standards often helped an organization determine if its service was effective for accrediting standards (Lessin, McGinnis, & Bean, 2002). With assessment measures so diverse, a national example might have helped to provide direction for local needs (Gross, McClure, Hodges, Graham, & Lankes, 2001). During the 1990s, more libraries started to offer DL resources and services comparable to those provided to campus-based students (Mahony, 1993). In 2000, the U.S. Department of Education identified 72% of public postsecondary institutions that offered digital reference via e-mail, including more than 65% of community colleges (Tabs, 2003, pp. 3, 51). Straw (2001) attributed the change to the advances in technology. Library services available to DL students included, but were not limited to, digital reference and instructional services, remote access to online research tools, database and research tutorials, interlibrary loan, and document delivery. Digital reference through (Hernon & McCl...