IOM

Institute for Objective Measurement, Inc.
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Welcome to the website of the IOM! We offer you information on a wide variety of measurement programs and services. Please click below on as many selections as you would like.

Research Papers, Notes and Reports (full text)
including "Measurement Essentials", "Popular Measurement"
Rasch Measurement SIG (AERA): Rasch Measurement Transactions
Rasch Software: Freeware and Paid Book Sales Rasch-friendly Journals
Mission Vision (under review) Definition of Measurement Board of Directors
Publications Certification (undex review) Conferences
Workshops
Chapters
Speakers Bureau Directory of Consultants To Reach Us Other Places To Look

2020 AERA E.F. Lindquist Lecture with Mark Wilson
This no-fee lecture is open to the public. REGISTER HERE!!!

It is broadly accepted that successful assessment is one of the best ways to improve educational outcomes (Black & Wiliam, 1998; Hattie & Timperley, 2007); and the focus of this improvement is finding "actionable information for improving classroom instruction" (Lehrer, 2021). In this presentation, I will describe a framework for designing assessments that is keyed to the scope of the educational interpretations. This framework articulates three levels of interpretations of assessment information:

  • at the micro level, teachers observe student responses to varied tasks, and make instream instructional interpretations of those responses;
  • at the meso level, teachers are seeking to confirm/explore their interpretations by dipping into the instructional stream; and
  • at the macro level (more commonly referred to as summative) teachers and administrators use samples of assessment tasks to record student progress on composite achievement outcomes.

Assessments operate at and between these three levels: (i) classroom-dependent observations that primarily function at the micro level, and (ii) classroom-independent tasks that function at the meso and (potentially) at the macro level. The former are designed to track closely the variation of student performance over time in a classroom instructional context, and latter are designed to provide a basis for triangulating student responses in classroom and school contexts.

This framing will be exemplified in a K-5 elementary school that is seeking to improve the quality of instruction and students' understandings of measure and rational number. The different levels of assessments and response interpretation will be instantiated with two different pieces of software, which operate at the micro level and the meso/macro levels, respectively.

References
  • Black, P., & Wiliam, D. (1998). Assessment and classroom learning. Assessment in Education: Principles, Policy and Practice, 5(1), 7-74.
  • Hattie, J., & Timperley, H. (2007). The power of feedback. Review of Educational Research, 77(1),81-112.
  • Lehrer, R. (2021). Accountable assessment. Keynote Address delivered at the ACER Research Conference 2021 (online)

New Rasch Measurement Book!!!
Andrich A Course in Rasch Measurement
https://www.springer.com/gp/book/9789811374951#aboutBook

This book applies Rasch measurement theory to the fields of education, psychology, sociology, marketing and health outcomes in order to measure various social constructs. The chief focus is on first principles of both the theory and its applications. Because software is readily available to carry out analyses of real data, numerous small examples are provided in the book. The software used in these examples, and which is helpful in working through the text, is RUMM2030 (Rasch unidimensional models for measurement).

The book's main goals are to equip researchers with the confidence they need in order to be in control of the analysis and interpretation of data, and to make professional rather than primarily statistical decisions mechanically. Because statistical principles are necessarily involved, reviews of the requisite statistics are provided in the Appendix.

The content is based on courses that have been taught both online and in intensive form for over two decades. Although first principles are emphasised, much of the book is based on research conducted by the two authors and their colleagues.


Best Test Design and Rating Scale Analysis are now available for free download!!!
Best Test Design Rating Scale Analysis
Publisher PDF (181MB) Publisher PDF (198MB)
Standard PDF (81MB) Standard PDF (81MB)
Reduced PDF (26MB) Reduced PDF (26MB)



Coming Rasch-related Events
Dec. 4 - Dec. 6, 2021, Sat.-Mon. On-line conference: PROMS2021, Pacific Rim Objective Measurement Symposium (T. Bond, Yanzi, R Statistics and more), proms.promsociety.org/2021/
Jan. 21 - Feb. 18, 2022, Fri.-Fri. On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com
May 20 - June 17, 2022, Fri.-Fri. On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com
June 24 - July 22, 2022, Fri.-Fri. On-line workshop: Practical Rasch Measurement - Further Topics (E. Smith, Winsteps), www.statistics.com
Aug. 12 - Sept. 9, 2022, Fri.-Fri. On-line workshop: Many-Facet Rasch Measurement (E. Smith, Facets), www.statistics.com
Oct. 7 - Nov. 4, 2022, Fri.-Fri. On-line workshop: Practical Rasch Measurement - Core Topics (E. Smith, Winsteps), www.statistics.com
June 23 - July 21, 2023, Fri.-Fri. On-line workshop: Practical Rasch Measurement - Further Topics (E. Smith, Winsteps), www.statistics.com
Aug. 11 - Sept. 8, 2023, Fri.-Fri. On-line workshop: Many-Facet Rasch Measurement (E. Smith, Facets), www.statistics.com