手法を比較

	ポリトマス尺度開発	順序尺度の開発
分野	心理測定学	心理測定学
系統	Latent structure	Latent structure
提唱年	1969–1982	1932 (Likert format); 1990s–2000s (ordinal-specific psychometric methods)
提唱者	Samejima, F.; Masters, G. N. (independently)	Rensis Likert (foundational ordinal response format); modern ordinal methodology codified by DeVellis and Finney & DiStefano
種類	Psychometric scale construction	Scale construction methodology
原典	Embretson, S. E. & Reise, S. P. (2000). Item Response Theory for Psychologists. Lawrence Erlbaum Associates. ISBN: 978-0805828191	DeVellis, R. F. (2017). Scale Development: Theory and Applications (4th ed.). SAGE Publications. ISBN: 978-1506341569
別名	polytomous item development, ordered-category scale construction, rating scale development, multi-category item development	Likert scale development, ordinal measurement scale construction, ordinal item development, polytomous scale construction
関連	6	5
概要	Polytomous scale development is the systematic construction and validation of measurement instruments whose items have three or more ordered response categories — such as Likert-type, rating, or partial-credit items. It applies polytomous item response theory models or ordinal factor analysis methods to evaluate item quality, estimate latent trait levels, and build a psychometrically sound scale.	Ordinal scale development is the systematic construction and validation of multi-item measurement instruments whose response options form an ordered but not necessarily equal-interval sequence — most commonly Likert-type formats (e.g., 1 = Strongly Disagree to 5 = Strongly Agree). It applies psychometric techniques that respect the ordinal nature of items rather than treating them as continuous.