Kuder

Kuder is a surname of German origin that appears in various European and North American contexts. Beyond its use as a family name, the term is associated with a number of standardized assessments in education and psychology.

In psychometrics, the Kuder–Richardson formulas are reliability coefficients for tests with dichotomous items. Introduced by Kuder and Richardson in the 1930s, KR-20 and KR-21 are among the most frequently cited variants and are used to estimate internal consistency.

In career guidance, the Kuder name is associated with the Kuder Career Planning System, a suite of assessments and planning tools designed to help individuals identify interests, plan education, and set career goals. The system is published by Kuder, Inc., a provider of career development resources used by schools, colleges, and workforce organizations.

The surname also appears in historical and genealogical contexts, with individuals bearing the name in various professions across German-speaking regions and beyond.