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ForewordThe TOEFL ® Monograph Series features commissioned papers and reports for TOEFL 2000 and other Test of English as a Foreign Language™ (TOEFL) test development efforts. As part of the foundation for the development of the TOEFL Internet-based test (TOEFL iBT), papers and research reports were commissioned from experts within the fields of measurement, language teaching, and testing through the TOEFL 2000 project. The resulting critical reviews, expert opinions, and research results have helped to inform TOEFL program development efforts with respect to test construct, test user needs, and test delivery. Opinions expressed in these papers are those of the authors and do not necessarily reflect the views or intentions of the TOEFL program.These monographs are also of general scholarly interest, and the TOEFL program is pleased to make them available to colleagues in the fields of language teaching and testing and international student admissions in higher education.The TOEFL 2000 project was a broad effort under which language testing at ETS ® would evolve into the 21st century. As a first step, the TOEFL program revised the Test of Spoken English™ (TSE ® ) and introduced a computer-based version of the TOEFL test. The revised TSE test, introduced in July 1995, is based on an underlying construct of communicative language ability and represents a process approach to test validation. The computer-based TOEFL test, introduced in 1998, took advantage of new forms of assessment and improved services made possible by computer-based testing, while also moving the program toward its longer-range goals, which included:• the development of a conceptual framework that takes into account models of communicative competence• a research program that informs and supports this emerging framework • a better understanding of the kinds of information test users need and want from the TOEFL test• a better understanding of the technological capabilities for delivery of TOEFL tests into the next century Monographs 16 through 20 were the working papers that laid out the TOEFL 2000 conceptual frameworks with their accompanying research agendas. The initial framework document, Monograph 16, described the process by which the project was to move from identifying the test domain to building an empirically based interpretation of test scores. The subsequent framework documents, Monographs 17-20, extended the conceptual frameworks to the domains of reading, writing, listening, and speaking (both as independent and interdependent domains). These conceptual frameworks guided the research and prototyping studies described in subsequent monographs that resulted in the final test model. The culm...