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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
Speakers Bureau Directory of Consultants To Reach Us Other Places To Look

1st Scandinavian Applied Measurement Conference
June 12-14, 2024
Kristianstad University, Kristianstad, Sweden

The Scandinavian Applied Measurement Conference (SAMC) aims to facilitate interaction and knowledge exchange among researchers, practitioners, and students.

The SAMC theme is applied measurement, focusing on rating scales and other category-based measurement and assessment instruments. Papers on the development, evaluation and quality assurance of such instruments using Rasch measurement theory and related approaches are welcome. Person-centred measurement, which emphasize the role of the individual person in the measurement process and analyses, as well as the use and interpretation of results at the level of the individual person, is encouraged. The conference will be multidisciplinary and cover fields such as the health, social, educational, behavioral, and related sciences.

Abstract submissions open on September 18, 2023.

For more information and updates, please visit the SAMC website:

New Rasch Measurement Book!!!
Wind and Hua Rasch Measurement Theory Analysis in R

We are pleased to share the publication of Rasch Measurement Theory Analysis in R. This book provides researchers and practitioners with a step-by-step guide for conducting Rasch measurement theory analyses using R. It includes theoretical introductions to major Rasch measurement principles and techniques, demonstrations of analyses using several R packages that contain Rasch measurement functions, and sample interpretations of results.

Key features of the book include:

  • Accessible to users with relatively little experience with R programming
  • Reproducible data analysis examples that can be modified to accommodate users’ own data
  • Accompanying e-book website with links to additional resources and R code updates as needed
  • Features dichotomous and polytomous (rating scale) Rasch models that can be applied to data from a wide range of disciplines

Andrich A Course in Rasch Measurement

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 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
Oct. 6 - Nov. 3, 2023, Fri.-Fri. On-line workshop: Rasch Measurement - Core Topics (E. Smith, Facets),
Oct. 12, 2023, Thursday 5 to 7 pm Colombian timeOn-line workshop: Deconstruyendo el concepto de validez y Discusiones sobre estimaciones de confiabilidad SICAPSI (J. Escobar, C.Pardo)
June 12 - 14, 2024, Wed.-Fri. 1st Scandinavian Applied Measurement Conference, Kristianstad University, Kristianstad, Sweden
Aug. 9 - Sept. 6, 2024, Fri.-Fri. On-line workshop: Many-Facet Rasch Measurement (E. Smith, Facets),