assessment-design-guide

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SKILL.md

Assessment Design Guide

A skill for designing, validating, and analyzing educational assessments using modern psychometric methods. Covers classical test theory, item response theory, test construction, validity evidence, and computerized adaptive testing.

Classical Test Theory

Reliability Analysis

Classical test theory (CTT) models observed scores as the sum of a true score and error:

X = T + E

Key reliability coefficients:

Coefficient Method Interpretation
Cronbach's alpha Internal consistency Homogeneity of items
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Apr 2, 2026